diff --git a/tests/tiny_psnr.c b/tests/tiny_psnr.c
index 5f791c168b..338845e7a0 100644
--- a/tests/tiny_psnr.c
+++ b/tests/tiny_psnr.c
@@ -190,7 +190,7 @@ static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes)
                     b = buf[1][j];
                 }
                 sse += (a - b) * (a - b);
-                dist = abs(a - b);
+                dist = llabs(a - b);
                 if (dist > maxdist)
                     maxdist = dist;
                 break;