diff --git a/asm.js b/asm.js
index cb1de69..6d69eb2 100644
--- a/asm.js
+++ b/asm.js
@@ -675,14 +675,15 @@ export class Assembler {
 
     action_symbol(action) {
         const func = this.funcs[this.current_func];
-        const index = this.lookup_param(func, action.symbol)
+        const value = this.lookup_param(func, action.symbol)
               ?? this.lookup_local(func, action.symbol)
-              ?? this.lookup_global(action.symbol);
-        if (index == null) {
+              ?? this.lookup_global(action.symbol)
+              ?? this.lookup_def(action.symbol);
+        if (value == null) {
             console.error(`ERROR: Unable to resolve symbol {action.symbol}`);
-            index = 0;
+            value = 0;
         }
-        func.body.push(index);
+        func.body.push(value);
     }
 
     action_mem(action) {