diff --git a/libavcodec/motion_est.c b/libavcodec/motion_est.c
index b14160f912..3f4faa42e8 100644
--- a/libavcodec/motion_est.c
+++ b/libavcodec/motion_est.c
@@ -291,7 +291,7 @@ static int cmp_qpel(MpegEncContext *s, const int x, const int y, const int subx,
 #include "motion_est_template.c"
 
 static int zero_cmp(MpegEncContext *s, uint8_t *a, uint8_t *b,
-                    int stride, int h)
+                    ptrdiff_t stride, int h)
 {
     return 0;
 }