diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index ca330cdf1..dbfd1e65b 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -5572,7 +5572,7 @@ codegen(codegen_scope *s, node *tree, int val)
   s->lineno = var_head->lineno;
 
   /* Process variable-sized node directly */
-  enum node_type var_type = var_head->node_type;
+  enum node_type var_type = (enum node_type)var_head->node_type;
 
   switch (var_type) {
   case NODE_INT: