1 files changed, 3 insertions, 0 deletions
diff --git a/src/stdio/vfscanf_s.c b/src/stdio/vfscanf_s.c
index ca7b84d1..7654abd3 100644
--- a/src/stdio/vfscanf_s.c
+++ b/src/stdio/vfscanf_s.c
@@ -1,9 +1,12 @@
 #include <stdio.h>
+#include <string.h>
 #include "_stdio.h"
 
 int vfscanf_s(FILE * restrict stream, const char * restrict format, va_list arg)
 {
 	SIGNAL_SAFE(0);
+	ASSERT_NOOVERLAP(stream, sizeof(*stream), format, strlen(format));
+
 	(void)stream; (void)format; (void)arg;
 	return 0;
 }