diff --git a/icu4c/source/common/cpputils.h b/icu4c/source/common/cpputils.h
index 70e30bb593..de09aea142 100644
--- a/icu4c/source/common/cpputils.h
+++ b/icu4c/source/common/cpputils.h
@@ -16,40 +16,48 @@
 
 #include "unicode/utypes.h"
 #include "cmemory.h"
-#include "unicode/unistr.h"
 
 /*==========================================================================*/
 /* Array copy utility functions */
 /*==========================================================================*/
 
+static
 inline void uprv_arrayCopy(const double* src, double* dst, int32_t count)
 { uprv_memcpy(dst, src, (size_t)(count * sizeof(*src))); }
 
+static
 inline void uprv_arrayCopy(const double* src, int32_t srcStart,
               double* dst, int32_t dstStart, int32_t count)
 { uprv_memcpy(dst+dstStart, src+srcStart, (size_t)(count * sizeof(*src))); }
 
+static
 inline void uprv_arrayCopy(const int8_t* src, int8_t* dst, int32_t count)
     { uprv_memcpy(dst, src, (size_t)(count * sizeof(*src))); }
 
+static
 inline void uprv_arrayCopy(const int8_t* src, int32_t srcStart,
               int8_t* dst, int32_t dstStart, int32_t count)
 { uprv_memcpy(dst+dstStart, src+srcStart, (size_t)(count * sizeof(*src))); }
 
+static
 inline void uprv_arrayCopy(const int16_t* src, int16_t* dst, int32_t count)
 { uprv_memcpy(dst, src, (size_t)(count * sizeof(*src))); }
 
+static
 inline void uprv_arrayCopy(const int16_t* src, int32_t srcStart,
               int16_t* dst, int32_t dstStart, int32_t count)
 { uprv_memcpy(dst+dstStart, src+srcStart, (size_t)(count * sizeof(*src))); }
 
+static
 inline void uprv_arrayCopy(const int32_t* src, int32_t* dst, int32_t count)
 { uprv_memcpy(dst, src, (size_t)(count * sizeof(*src))); }
 
+static
 inline void uprv_arrayCopy(const int32_t* src, int32_t srcStart,
               int32_t* dst, int32_t dstStart, int32_t count)
 { uprv_memcpy(dst+dstStart, src+srcStart, (size_t)(count * sizeof(*src))); }
 
+static
 inline void
 uprv_arrayCopy(const UChar *src, int32_t srcStart,
         UChar *dst, int32_t dstStart, int32_t count)
diff --git a/icu4c/source/common/unicode/utypes.h b/icu4c/source/common/unicode/utypes.h
index 76a99c2668..84b3b93e51 100644
--- a/icu4c/source/common/unicode/utypes.h
+++ b/icu4c/source/common/unicode/utypes.h
@@ -471,18 +471,18 @@ typedef enum UErrorCode UErrorCode;
 /* operational success or failure. */
 
 #ifdef XP_CPLUSPLUS
-U_NAMESPACE_BEGIN
     /**
      * Does the error code indicate success?
      * @stable
      */
+    static
     inline UBool U_SUCCESS(UErrorCode code) { return (UBool)(code<=U_ZERO_ERROR); }
     /**
      * Does the error code indicate a failure?
      * @stable
      */
+    static
     inline UBool U_FAILURE(UErrorCode code) { return (UBool)(code>U_ZERO_ERROR); }
-U_NAMESPACE_END
 #else
     /**
      * Does the error code indicate success?