diff --git a/contrib/ethereum/libethash/progpow.cpp b/contrib/ethereum/libethash/progpow.cpp
index fd709e8f..a7b85c0e 100644
--- a/contrib/ethereum/libethash/progpow.cpp
+++ b/contrib/ethereum/libethash/progpow.cpp
@@ -117,9 +117,9 @@ inline uint32_t random_math(uint32_t a, uint32_t b, uint32_t selector) noexcept
     {
     default:
     case 0:
-        return a + b;
-    case 1:
         return a * b;
+    case 1:
+      return a + b;
     case 2:
         return mul_hi32(a, b);
     case 3: