diff --git a/libavutil/sha.c b/libavutil/sha.c
index 1f1de2c6e9..3107deeffe 100644
--- a/libavutil/sha.c
+++ b/libavutil/sha.c
@@ -180,7 +180,7 @@ static void sha256_transform(uint32_t *state, const uint8_t buffer[64])
 {
     unsigned int i, a, b, c, d, e, f, g, h;
     uint32_t block[64];
-    uint32_t T1, T2;
+    uint32_t T1, av_unused(T2);
 
     a = state[0];
     b = state[1];