diff --git a/icu4c/source/test/cintltst/cucdtst.c b/icu4c/source/test/cintltst/cucdtst.c
index 876a6ae24a7..f315f4c4085 100644
--- a/icu4c/source/test/cintltst/cucdtst.c
+++ b/icu4c/source/test/cintltst/cucdtst.c
@@ -603,7 +603,7 @@ void setUpDataTable()
     
 }
 
-void cleanUpDataTable()
+U_CFUNC void cleanUpDataTable()
 {
     int32_t i,j;
     if(dataTable != NULL) {
diff --git a/icu4c/source/test/cintltst/cucdtst.h b/icu4c/source/test/cintltst/cucdtst.h
index 6b797e921f6..3ceebd3a74a 100644
--- a/icu4c/source/test/cintltst/cucdtst.h
+++ b/icu4c/source/test/cintltst/cucdtst.h
@@ -35,5 +35,5 @@ int32_t MakeProp(char* str);
 int32_t MakeDir(char* str);
 
 void setUpDataTable(void);
-void cleanUpDataTable(void);
+U_CFUNC void cleanUpDataTable(void);
 #endif