diff --git a/dlls/mountmgr.sys/cred.c b/dlls/mountmgr.sys/cred.c
index 9fb9e433881..5c95dff5cab 100644
--- a/dlls/mountmgr.sys/cred.c
+++ b/dlls/mountmgr.sys/cred.c
@@ -64,7 +64,7 @@ NTSTATUS query_symbol_file( void *args )
 
     if (!(query_cfstring = CFStringCreateWithFormat(kCFAllocatorDefault, NULL,
                                                     CFSTR("com_apple_xcode_dsym_uuids == \"%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X\""),
-                                                    id->Data1, id->Data2, id->Data3, id->Data4[0],
+                                                    (unsigned int)id->Data1, id->Data2, id->Data3, id->Data4[0],
                                                     id->Data4[1], id->Data4[2], id->Data4[3], id->Data4[4],
                                                     id->Data4[5], id->Data4[6], id->Data4[7] )))
         return STATUS_NO_MEMORY;