diff --git a/programs/uninstaller/main.c b/programs/uninstaller/main.c
index 1c834eac59d..736593e27d7 100644
--- a/programs/uninstaller/main.c
+++ b/programs/uninstaller/main.c
@@ -97,7 +97,7 @@ static void output_formatstring(const WCHAR *fmt, __ms_va_list va_args)
     LocalFree(str);
 }
 
-static void __cdecl output_message(unsigned int id, ...)
+static void WINAPIV output_message(unsigned int id, ...)
 {
     WCHAR fmt[1024];
     __ms_va_list va_args;
@@ -112,7 +112,7 @@ static void __cdecl output_message(unsigned int id, ...)
     __ms_va_end(va_args);
 }
 
-static void __cdecl output_array(WCHAR *fmt, ...)
+static void WINAPIV output_array(WCHAR *fmt, ...)
 {
     __ms_va_list va_args;