diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index 64f4702a7..901e87934 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -1383,7 +1383,7 @@ codegen(codegen_scope *s, node *tree, int val)
     break;
 
   case NODE_LAMBDA:
-    {
+    if (val) {
       int idx = lambda_body(s, tree, 1);
 
       genop(s, MKOP_Abc(OP_LAMBDA, cursp(), idx, OP_L_LAMBDA));
@@ -1392,7 +1392,7 @@ codegen(codegen_scope *s, node *tree, int val)
     break;
 
   case NODE_BLOCK:
-    {
+    if (val) {
       int idx = lambda_body(s, tree, 1);
 
       genop(s, MKOP_Abc(OP_LAMBDA, cursp(), idx, OP_L_BLOCK));