diff --git a/reactos/lib/msvcrt/stdio/vfprintf.c b/reactos/lib/msvcrt/stdio/vfprintf.c
index 4beda1c3629..7dbe0b89f90 100644
--- a/reactos/lib/msvcrt/stdio/vfprintf.c
+++ b/reactos/lib/msvcrt/stdio/vfprintf.c
@@ -559,6 +559,7 @@ int __vfprintf(FILE *f, const char *fmt, va_list args)
 		}
 
 		/* get the conversion qualifier */
+		qualifier = 0;
 		// %Z can be just stand alone or as size_t qualifier
 		if ( *fmt == 'Z' ) {
 			qualifier = *fmt;
diff --git a/reactos/lib/msvcrt/stdio/vfwprint.c b/reactos/lib/msvcrt/stdio/vfwprint.c
index 96c88595662..91082d7971c 100644
--- a/reactos/lib/msvcrt/stdio/vfwprint.c
+++ b/reactos/lib/msvcrt/stdio/vfwprint.c
@@ -558,6 +558,7 @@ int __vfwprintf(FILE *f, const wchar_t *fmt, va_list args)
 		}
 
 		/* get the conversion qualifier */
+		qualifier=0;
 		// %Z can be just stand alone or as size_t qualifier
 		if ( *fmt == 'Z' ) {
 			qualifier = *fmt;