diff --git a/icu4c/source/i18n/reldatefmt.cpp b/icu4c/source/i18n/reldatefmt.cpp
index a9b60057e0..61de3098ed 100644
--- a/icu4c/source/i18n/reldatefmt.cpp
+++ b/icu4c/source/i18n/reldatefmt.cpp
@@ -58,14 +58,13 @@ U_CDECL_END
 
 U_NAMESPACE_BEGIN
 
-static int32_t getStyleIndex(UDateFormatStyle style) {
+static int32_t getStyleIndex(UDateRelativeDateTimeFormatterStyle style) {
     switch (style) {
-        case UDAT_FULL:
-        case UDAT_LONG:
+        case UDAT_STYLE_LONG:
             return 0;
-        case UDAT_MEDIUM:
+        case UDAT_STYLE_SHORT:
             return 1;
-        case UDAT_SHORT:
+        case UDAT_STYLE_NARROW:
             return 2;
         default:
             return 0;
@@ -669,7 +668,7 @@ RelativeDateTimeFormatter::RelativeDateTimeFormatter(UErrorCode& status) :
         fCache(NULL),
         fNumberFormat(NULL),
         fPluralRules(NULL),
-        fStyle(UDAT_FULL),
+        fStyle(UDAT_STYLE_LONG),
         fContext(UDISPCTX_CAPITALIZATION_NONE),
         fOptBreakIterator(NULL) {
     init(NULL, NULL, status);
@@ -680,7 +679,7 @@ RelativeDateTimeFormatter::RelativeDateTimeFormatter(
         fCache(NULL),
         fNumberFormat(NULL),
         fPluralRules(NULL),
-        fStyle(UDAT_FULL),
+        fStyle(UDAT_STYLE_LONG),
         fContext(UDISPCTX_CAPITALIZATION_NONE),
         fOptBreakIterator(NULL),
         fLocale(locale) {
@@ -692,7 +691,7 @@ RelativeDateTimeFormatter::RelativeDateTimeFormatter(
         fCache(NULL),
         fNumberFormat(NULL),
         fPluralRules(NULL),
-        fStyle(UDAT_FULL),
+        fStyle(UDAT_STYLE_LONG),
         fContext(UDISPCTX_CAPITALIZATION_NONE),
         fOptBreakIterator(NULL),
         fLocale(locale) {
@@ -702,7 +701,7 @@ RelativeDateTimeFormatter::RelativeDateTimeFormatter(
 RelativeDateTimeFormatter::RelativeDateTimeFormatter(
         const Locale& locale,
         NumberFormat *nfToAdopt,
-        UDateFormatStyle styl,
+        UDateRelativeDateTimeFormatterStyle styl,
         UDisplayContext capitalizationContext,
         UErrorCode& status) :
         fCache(NULL),
@@ -784,7 +783,7 @@ UDisplayContext RelativeDateTimeFormatter::getCapitalizationContext() const {
     return fContext;
 }
 
-UDateFormatStyle RelativeDateTimeFormatter::getFormatStyle() const {
+UDateRelativeDateTimeFormatterStyle RelativeDateTimeFormatter::getFormatStyle() const {
     return fStyle;
 }
 
diff --git a/icu4c/source/i18n/unicode/reldatefmt.h b/icu4c/source/i18n/unicode/reldatefmt.h
index bbff21194c..1ca375ebef 100644
--- a/icu4c/source/i18n/unicode/reldatefmt.h
+++ b/icu4c/source/i18n/unicode/reldatefmt.h
@@ -15,7 +15,6 @@
 #include "unicode/utypes.h"
 #include "unicode/uobject.h"
 #include "unicode/udisplaycontext.h"
-#include "unicode/udat.h"
 #include "unicode/locid.h"
 
 /**
@@ -27,6 +26,31 @@
 
 #ifndef U_HIDE_DRAFT_API
 
+/**
+ * The formatting style
+ * @draft ICU 54
+ */
+typedef enum UDateRelativeDateTimeFormatterStyle {
+
+  /**
+   * Everything spelled out.
+   * @draft ICU 54
+   */
+  UDAT_STYLE_LONG,
+
+  /**
+   * Abbreviations used when possible.
+   * @draft ICU 54
+   */
+  UDAT_STYLE_SHORT,
+
+  /**
+   * Use the shortest possible form.
+   * @draft ICU 54
+   */
+  UDAT_STYLE_NARROW,
+}; 
+
 /**
  * Represents the unit for formatting a relative date. e.g "in 5 days"
  * or "in 3 months"
@@ -345,7 +369,7 @@ public:
     RelativeDateTimeFormatter(
             const Locale& locale,
             NumberFormat *nfToAdopt,
-            UDateFormatStyle style,
+            UDateRelativeDateTimeFormatterStyle style,
             UDisplayContext capitalizationContext,
             UErrorCode& status);
 
@@ -445,12 +469,12 @@ public:
      *
      * @draft ICU 54
      */
-    UDateFormatStyle getFormatStyle() const;
+    UDateRelativeDateTimeFormatterStyle getFormatStyle() const;
 private:
     const RelativeDateTimeCacheData* fCache;
     const SharedNumberFormat *fNumberFormat;
     const SharedPluralRules *fPluralRules;
-    UDateFormatStyle fStyle;
+    UDateRelativeDateTimeFormatterStyle fStyle;
     UDisplayContext fContext;
     const SharedBreakIterator *fOptBreakIterator;
     Locale fLocale;
diff --git a/icu4c/source/test/intltest/reldatefmttest.cpp b/icu4c/source/test/intltest/reldatefmttest.cpp
index eeda64c6d6..76dd84de7a 100644
--- a/icu4c/source/test/intltest/reldatefmttest.cpp
+++ b/icu4c/source/test/intltest/reldatefmttest.cpp
@@ -550,7 +550,7 @@ private:
             int32_t expectedResultLength);
     void RunTest(
             const Locale& locale,
-            UDateFormatStyle style,
+            UDateRelativeDateTimeFormatterStyle style,
             const WithQuantityExpected* expectedResults,
             int32_t expectedResultLength);
     void RunTest(
@@ -559,7 +559,7 @@ private:
             int32_t expectedResultLength);
     void RunTest(
             const Locale& locale,
-            UDateFormatStyle style,
+            UDateRelativeDateTimeFormatterStyle style,
             const WithoutQuantityExpected* expectedResults,
             int32_t expectedResultLength);
     void RunTest(
@@ -625,7 +625,7 @@ void RelativeDateTimeFormatterTest::TestEnglishCaps() {
     RelativeDateTimeFormatter fmt(
             "en",
             NULL,
-            UDAT_FULL,
+            UDAT_STYLE_LONG,
             UDISPCTX_CAPITALIZATION_FOR_BEGINNING_OF_SENTENCE,
             status);
     RelativeDateTimeFormatter fmt3(status);
@@ -638,11 +638,11 @@ void RelativeDateTimeFormatterTest::TestEnglishCaps() {
 }
 
 void RelativeDateTimeFormatterTest::TestEnglishShort() {
-    RunTest("en", UDAT_MEDIUM, kEnglishShort, LENGTHOF(kEnglishShort));
+    RunTest("en", UDAT_STYLE_SHORT, kEnglishShort, LENGTHOF(kEnglishShort));
 }
 
 void RelativeDateTimeFormatterTest::TestEnglishNarrow() {
-    RunTest("en", UDAT_SHORT, kEnglishNarrow, LENGTHOF(kEnglishNarrow));
+    RunTest("en", UDAT_STYLE_NARROW, kEnglishNarrow, LENGTHOF(kEnglishNarrow));
 }
 
 void RelativeDateTimeFormatterTest::TestSerbian() {
@@ -650,7 +650,7 @@ void RelativeDateTimeFormatterTest::TestSerbian() {
 }
 
 void RelativeDateTimeFormatterTest::TestSerbianFallback() {
-    RunTest("sr", UDAT_SHORT, kSerbian, LENGTHOF(kSerbian));
+    RunTest("sr", UDAT_STYLE_NARROW, kSerbian, LENGTHOF(kSerbian));
 }
 
 void RelativeDateTimeFormatterTest::TestEnglishNoQuantity() {
@@ -662,7 +662,7 @@ void RelativeDateTimeFormatterTest::TestEnglishNoQuantityCaps() {
     RelativeDateTimeFormatter fmt(
             "en",
             NULL,
-            UDAT_FULL,
+            UDAT_STYLE_LONG,
             UDISPCTX_CAPITALIZATION_FOR_BEGINNING_OF_SENTENCE,
             status);
     assertSuccess("", status);
@@ -676,7 +676,7 @@ void RelativeDateTimeFormatterTest::TestEnglishNoQuantityCaps() {
 void RelativeDateTimeFormatterTest::TestEnglishNoQuantityShort() {
     RunTest(
             "en",
-            UDAT_MEDIUM,
+            UDAT_STYLE_SHORT,
             kEnglishNoQuantityShort,
             LENGTHOF(kEnglishNoQuantityShort));
 }
@@ -684,7 +684,7 @@ void RelativeDateTimeFormatterTest::TestEnglishNoQuantityShort() {
 void RelativeDateTimeFormatterTest::TestEnglishNoQuantityNarrow() {
     RunTest(
             "en",
-            UDAT_SHORT,
+            UDAT_STYLE_NARROW,
             kEnglishNoQuantityNarrow,
             LENGTHOF(kEnglishNoQuantityNarrow));
 }
@@ -747,7 +747,7 @@ void RelativeDateTimeFormatterTest::TestGetters() {
     RelativeDateTimeFormatter fmt(
             "en",
             NULL,
-            UDAT_SHORT,
+            UDAT_STYLE_NARROW,
             UDISPCTX_CAPITALIZATION_FOR_MIDDLE_OF_SENTENCE,
             status);
     RelativeDateTimeFormatter fmt3(status);
@@ -755,7 +755,7 @@ void RelativeDateTimeFormatterTest::TestGetters() {
     // copy and assignment.
     RelativeDateTimeFormatter fmt2(fmt);
     fmt3 = fmt2;
-    assertEquals("style", UDAT_SHORT, fmt3.getFormatStyle());
+    assertEquals("style", UDAT_STYLE_NARROW, fmt3.getFormatStyle());
     assertEquals(
             "context",
             UDISPCTX_CAPITALIZATION_FOR_MIDDLE_OF_SENTENCE,
@@ -785,7 +785,7 @@ void RelativeDateTimeFormatterTest::TestCombineDateAndTime() {
 void RelativeDateTimeFormatterTest::TestBadDisplayContext() {
     UErrorCode status = U_ZERO_ERROR;
     RelativeDateTimeFormatter fmt(
-            "en", NULL, UDAT_FULL, UDISPCTX_STANDARD_NAMES, status);
+            "en", NULL, UDAT_STYLE_LONG, UDISPCTX_STANDARD_NAMES, status);
     if (status != U_ILLEGAL_ARGUMENT_ERROR) {
         errln("Expected U_ILLEGAL_ARGUMENT_ERROR, got %s", u_errorName(status));
     }
@@ -808,7 +808,7 @@ void RelativeDateTimeFormatterTest::RunTest(
 
 void RelativeDateTimeFormatterTest::RunTest(
         const Locale& locale,
-        UDateFormatStyle style,
+        UDateRelativeDateTimeFormatterStyle style,
         const WithQuantityExpected* expectedResults,
         int32_t expectedResultLength) {
     UErrorCode status = U_ZERO_ERROR;
@@ -836,7 +836,7 @@ void RelativeDateTimeFormatterTest::RunTest(
 
 void RelativeDateTimeFormatterTest::RunTest(
         const Locale& locale,
-        UDateFormatStyle style,
+        UDateRelativeDateTimeFormatterStyle style,
         const WithoutQuantityExpected* expectedResults,
         int32_t expectedResultLength) {
     UErrorCode status = U_ZERO_ERROR;