1 files changed, 1 insertions, 1 deletions

diff --git a/uisimulator/win32/debug-win32.c b/uisimulator/win32/debug-win32.c
index 520473dd71..b393372a76 100644
--- a/uisimulator/win32/debug-win32.c
+++ b/uisimulator/win32/debug-win32.c
@@ -47,7 +47,7 @@ void debug( const char *message )
         printf("%s", message);
 }
 
-void debugf(char *fmt, ...)
+void debugf(const char *fmt, ...)
 {
     va_list ap;