diff --git a/icu4c/source/common/uvector.h b/icu4c/source/common/uvector.h
index a44f00b6ec..7a74c07781 100644
--- a/icu4c/source/common/uvector.h
+++ b/icu4c/source/common/uvector.h
@@ -66,8 +66,8 @@
  */
 class U_COMMON_API UVector {
 public:
-    typedef void (*Deleter)(void*);
-    typedef UBool (*Comparer)(void*, void*);
+    typedef void (* U_CALLCONV Deleter)(void*);
+    typedef UBool (* U_CALLCONV Comparer)(const void*, const void*);
 
 private:
     int32_t count;