diff --git a/asm.js b/asm.js
index 3a2c7e4..4128148 100644
--- a/asm.js
+++ b/asm.js
@@ -593,9 +593,14 @@ class Parser {
         if (value == null) {
             action.symbol = token;
         } else {
-            if (value > 0xffff)
+            if (value > 0xffffffff)
                 console.error(`WARNING: Value ${token} is truncated`);
-            action.value = [ value & 0xff, (value >> 8) & 0xff ];
+            action.value = [
+                value & 0xff,
+                (value >> 8) & 0xff,
+                (value >> 16) & 0xff,
+                (value >> 24) & 0xff,
+            ];
         }
         return action;
     }