diff --git a/include/stdio.h b/include/stdio.h
index 922dde8ee92..a79a0071eba 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -148,7 +148,8 @@ int    fputs(FAR const IPTR char *s, FAR FILE *stream);
 size_t fread(FAR void *ptr, size_t size, size_t n_items, FAR FILE *stream);
 FAR FILE *freopen(FAR const char *path, FAR const char *mode,
          FAR FILE *stream);
-int    fscanf(FAR FILE *stream, FAR const IPTR char *fmt, ...);
+int    fscanf(FAR FILE *stream, FAR const IPTR char *fmt, ...)
+       scanflike(2, 3);
 int    fseek(FAR FILE *stream, long int offset, int whence);
 int    fseeko(FAR FILE *stream, off_t offset, int whence);
 int    fsetpos(FAR FILE *stream, FAR fpos_t *pos);
@@ -186,21 +187,24 @@ int    asprintf(FAR char **ptr, FAR const IPTR char *fmt, ...)
        printflike(2, 3);
 int    snprintf(FAR char *buf, size_t size,
          FAR const IPTR char *fmt, ...) printflike(3, 4);
-int    sscanf(FAR const char *buf, FAR const IPTR char *fmt, ...);
+int    sscanf(FAR const char *buf, FAR const IPTR char *fmt, ...)
+       scanflike(2, 3);
 
-int    scanf(FAR const IPTR char *fmt, ...);
+int    scanf(FAR const IPTR char *fmt, ...) scanflike(1, 2);
 int    vasprintf(FAR char **ptr, FAR const IPTR char *fmt, va_list ap)
        printflike(2, 0);
 int    vfprintf(FAR FILE *stream, FAR const IPTR char *fmt,
          va_list ap) printflike(2, 0);
-int    vfscanf(FAR FILE *stream, FAR const IPTR char *fmt, va_list ap);
+int    vfscanf(FAR FILE *stream, FAR const IPTR char *fmt, va_list ap)
+       scanflike(2, 0);
 int    vprintf(FAR const IPTR char *fmt, va_list ap) printflike(1, 0);
-int    vscanf(FAR const IPTR char *fmt, va_list ap);
+int    vscanf(FAR const IPTR char *fmt, va_list ap) scanflike(1, 0);
 int    vsnprintf(FAR char *buf, size_t size, FAR const IPTR char *fmt,
          va_list ap) printflike(3, 0);
 int    vsprintf(FAR char *buf, FAR const IPTR char *fmt, va_list ap)
        printflike(2, 0);
-int    vsscanf(FAR const char *buf, FAR const IPTR char *fmt, va_list ap);
+int    vsscanf(FAR const char *buf, FAR const IPTR char *fmt, va_list ap)
+       scanflike(2, 0);
 
 /* Operations on file descriptors including:
  *