diff --git a/tests/tiny_psnr.c b/tests/tiny_psnr.c
index b35ed810fe..e09f394f0e 100644
--- a/tests/tiny_psnr.c
+++ b/tests/tiny_psnr.c
@@ -273,6 +273,9 @@ int main(int argc, char *argv[])
     int max_psnr   = -1;
     int max_psnr_shift = 0;
 
+    if (shift_last > shift_first)
+        shift_first -= shift_last - shift_first;
+
     if (argc > 3) {
         if (!strcmp(argv[3], "u8")) {
             len = 1;