diff --git a/libavutil/sha1.c b/libavutil/sha1.c
index b8bf2c3967d283c78c35145bbb55afeff3a7d2ce..97f2f9caa5afc3075bbd297d048396209ebbf686 100644
--- a/libavutil/sha1.c
+++ b/libavutil/sha1.c
@@ -122,7 +122,7 @@ void av_sha1_final(AVSHA1* context, uint8_t digest[20]){
 }
 
 // use the following to test
-// gcc -DTEST -DHAVE_AV_CONFIG_H -I.. sha1.c -O3 -W -Wall -o sha1 && time ./sha1
+// gcc -DTEST -DHAVE_AV_CONFIG_H -I.. sha1.c -O2 -W -Wall -o sha1 && time ./sha1
 #ifdef TEST
 #include <stdio.h>
 #undef printf