diff --git a/asm.js b/asm.js
index 2266591..5041d3f 100644
--- a/asm.js
+++ b/asm.js
@@ -963,7 +963,7 @@ export class Assembler {
             }
             func.body.push(...this.leb128(def_value));
         } else {
-            func.body.push(...this.leb128(value));
+            func.body.push(...this.uleb128(value));
         }
     }