diff --git a/compiler/extensions/cpp/src/zserio/extension/cpp/CppExpressionFormattingPolicy.java b/compiler/extensions/cpp/src/zserio/extension/cpp/CppExpressionFormattingPolicy.java
index a713b86bc..62b5a96b5 100644
--- a/compiler/extensions/cpp/src/zserio/extension/cpp/CppExpressionFormattingPolicy.java
+++ b/compiler/extensions/cpp/src/zserio/extension/cpp/CppExpressionFormattingPolicy.java
@@ -252,7 +252,7 @@ public BinaryExpressionFormatting getLeftShift(Expression expr)
         }
         else
         {
-            return new BinaryExpressionFormatting("(", ") * (1 << (", "))");
+            return new BinaryExpressionFormatting("(", ") * (1U << (", "))");
         }
     }