diff --git a/icu4c/source/test/intltest/numfmtst.cpp b/icu4c/source/test/intltest/numfmtst.cpp
index 7e54a18992..1a047e4299 100644
--- a/icu4c/source/test/intltest/numfmtst.cpp
+++ b/icu4c/source/test/intltest/numfmtst.cpp
@@ -672,6 +672,7 @@ void NumberFormatTest::runIndexedTest( int32_t index, UBool exec, const char* &n
   TESTCASE_AUTO(Test11645_ApplyPatternEquality);
   TESTCASE_AUTO(Test12567);
   TESTCASE_AUTO(Test13056_GroupingSize);
+  TESTCASE_AUTO(Test11648_ExpDecFormatMalPattern);
   TESTCASE_AUTO_END;
 }
 
@@ -9396,4 +9397,17 @@ void NumberFormatTest::Test13056_GroupingSize() {
     assertEquals("Secondary should remember explicit setting and return 3", 3, df.getSecondaryGroupingSize());
 }
 
+void NumberFormatTest::Test11648_ExpDecFormatMalPattern() {
+    UErrorCode status = U_ZERO_ERROR;
+
+    DecimalFormat fmt("0.00", status);
+    fmt.setScientificNotation(TRUE);
+    UnicodeString pattern;
+
+    assertEquals("", "0.00E0", fmt.toPattern(pattern));
+
+    DecimalFormat fmt2(pattern, status);
+    assertSuccess("", status);
+}
+
 #endif /* #if !UCONFIG_NO_FORMATTING */
diff --git a/icu4c/source/test/intltest/numfmtst.h b/icu4c/source/test/intltest/numfmtst.h
index 925a1c3d22..d675d1461b 100644
--- a/icu4c/source/test/intltest/numfmtst.h
+++ b/icu4c/source/test/intltest/numfmtst.h
@@ -237,6 +237,7 @@ class NumberFormatTest: public CalendarTimeZoneTest {
     void Test11645_ApplyPatternEquality();
     void Test12567();
     void Test13056_GroupingSize();
+    void Test11648_ExpDecFormatMalPattern();
 
  private:
     UBool testFormattableAsUFormattable(const char *file, int line, Formattable &f);