diff --git a/src/stdio/vfscanf.c b/src/stdio/vfscanf.c
index 68c8e2cf2fd9fcb2f98624d1961c8390ddab8c0e..c0e607f533ed355328a33fc7861965b5d4df40a5 100644
--- a/src/stdio/vfscanf.c
+++ b/src/stdio/vfscanf.c
@@ -118,6 +118,8 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
 		}
 
 		if (*p=='m') {
+			wcs = 0;
+			s = 0;
 			alloc = !!dest;
 			p++;
 		} else {