1 files changed, 2 insertions, 1 deletions

diff --git a/lib-src/make-fingerprint.c b/lib-src/make-fingerprint.c
index 5779e0d2746..2417548d8ca 100644
--- a/lib-src/make-fingerprint.c
+++ b/lib-src/make-fingerprint.c
@@ -144,7 +144,8 @@ main (int argc, char **argv)
 
       for (char *finger = buf;
            (finger = memmem (finger, buf + chunksz - finger,
-                             fingerprint, sizeof fingerprint));
+                             (unsigned char *) fingerprint,
+                             sizeof fingerprint));
            finger++)
         {
           if (! (fseeko (f, finger - buf, SEEK_SET) == 0