diff --git a/src/codegen.cpp b/src/codegen.cpp
index cc71be8..ddb929a 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -252,6 +252,8 @@ namespace AST {
             }
         }
 
+        builder.builder->CreateRetVoid();
+
         llvm::verifyFunction(*function);
 
         builder.block = nullptr;