diff --git a/src/compiler/jsgen.js b/src/compiler/jsgen.js
index 9af1a8f1..4b800e2a 100644
--- a/src/compiler/jsgen.js
+++ b/src/compiler/jsgen.js
@@ -328,7 +328,7 @@ class JSGenerator {
         case 'args.boolean':
             return new TypedInput(`toBoolean(p${node.index})`, TYPE_BOOLEAN);
         case 'args.stringNumber':
-            return new TypedInput(`p${node.index}`, TYPE_BOOLEAN);
+            return new TypedInput(`p${node.index}`, TYPE_UNKNOWN);
 
         case 'compat':
             return new TypedInput(`(${this.generateCompatibilityLayerCall(node)})`, TYPE_UNKNOWN);