Index: runtime/src/kmp_i18n.h
===================================================================
--- runtime/src/kmp_i18n.h
+++ runtime/src/kmp_i18n.h
@@ -128,7 +128,7 @@
 // Helper functions. Creates messages either from message catalog or from system. Note: these
 // functions allocate memory. You should pass created messages to __kmp_msg() function, it will
 // print messages and destroy them.
-kmp_msg_t  __kmp_msg_format( kmp_i18n_id_t id, ... );
+kmp_msg_t  __kmp_msg_format( unsigned id_arg, ... );
 kmp_msg_t  __kmp_msg_error_code( int code );
 kmp_msg_t  __kmp_msg_error_mesg( char const * mesg );
 
Index: runtime/src/kmp_i18n.c
===================================================================
--- runtime/src/kmp_i18n.c
+++ runtime/src/kmp_i18n.c
@@ -703,7 +703,7 @@
 
 kmp_msg_t
 __kmp_msg_format(
-    kmp_i18n_id_t id,
+    unsigned id_arg,
     ...
 ) {
 
@@ -712,7 +712,13 @@
     kmp_str_buf_t  buffer;
     __kmp_str_buf_init( & buffer );
 
-    va_start( args, id );
+    va_start( args, id_arg );
+
+    // We use unsigned for the ID argument and explicitly cast it here to the
+    // right enumerator because variadic functions are not compatible with
+    // default promotions.
+    kmp_i18n_id_t id = (kmp_i18n_id_t)id_arg;
+
     #if KMP_OS_UNIX
         // On Linux* OS and OS X*, printf() family functions process parameter numbers, for example:
         // "%2$s %1$s".
Index: runtime/src/thirdparty/ittnotify/ittnotify_static.c
===================================================================
--- runtime/src/thirdparty/ittnotify/ittnotify_static.c
+++ runtime/src/thirdparty/ittnotify/ittnotify_static.c
@@ -285,10 +285,16 @@
 #pragma warning(disable: 4055) /* warning C4055: 'type cast' : from data pointer 'void *' to function pointer 'XXX' */
 #endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
 
-static void __itt_report_error(__itt_error_code code, ...)
+static void __itt_report_error(unsigned code_arg, ...)
 {
     va_list args;
-    va_start(args, code);
+    va_start(args, code_arg);
+
+    // We use unsigned for the code argument and explicitly cast it here to the
+    // right enumerator because variadic functions are not compatible with
+    // default promotions.
+    __itt_error_code code = (__itt_error_code)code_arg;
+
     if (_N_(_ittapi_global).error_handler != NULL)
     {
         __itt_error_handler_t* handler = (__itt_error_handler_t*)(size_t)_N_(_ittapi_global).error_handler;