diff --git a/circuits/sha256/main.circom b/circuits/sha256/main.circom
index 88d69d6f..c066198b 100644
--- a/circuits/sha256/main.circom
+++ b/circuits/sha256/main.circom
@@ -28,7 +28,7 @@ template Main() {
     component sha256_2 = Sha256_2();
 
     sha256_2.a <== a;
-    sha256_2.b <== a;
+    sha256_2.b <== b;
     out <== sha256_2.out;
 }