diff --git a/icu4c/source/common/ucnv_err.h b/icu4c/source/common/ucnv_err.h
index aabb0b32959..948f4c2cea4 100644
--- a/icu4c/source/common/ucnv_err.h
+++ b/icu4c/source/common/ucnv_err.h
@@ -39,7 +39,7 @@
 #ifndef UCNV_ERR_H
 #define UCNV_ERR_H
 
-
+#include "ucnv.h"
 #include "utypes.h"
 
 
diff --git a/icu4c/source/common/umutex.h b/icu4c/source/common/umutex.h
index 627e38cc1dd..0ac1752b246 100644
--- a/icu4c/source/common/umutex.h
+++ b/icu4c/source/common/umutex.h
@@ -52,9 +52,6 @@ typedef void * Mutex;
  * mistake which silently slips through the compiler!!  */
 
 
-/* Mutex data type. */
-typedef void *UMTX;
-
 /* Lock a mutex. Pass in NULL if you want the (ick) Single Global
    Mutex. */
 U_CAPI void  U_EXPORT2 umtx_lock   ( UMTX* mutex ); 
diff --git a/icu4c/source/common/utypes.h b/icu4c/source/common/utypes.h
index 6cda108251e..5007ece9030 100644
--- a/icu4c/source/common/utypes.h
+++ b/icu4c/source/common/utypes.h
@@ -363,6 +363,12 @@ u_errorName(UErrorCode code);
 /* Include header for platform utilies */
 /*===========================================================================*/
 
+
+
+/* Mutex data type.  INTERNAL.*/
+typedef void *UMTX;
+
+
 #include "putil.h"
 
 #endif /* _UTYPES */