diff --git a/packages/gems/js/lib/js.rb b/packages/gems/js/lib/js.rb
index b5c6f68350..04ef16761e 100644
--- a/packages/gems/js/lib/js.rb
+++ b/packages/gems/js/lib/js.rb
@@ -173,7 +173,11 @@ def method_missing(sym, *args, &block)
     if sym_str.end_with?("?")
       # When a JS method is called with a ? suffix, it is treated as a predicate method,
       # and the return value is converted to a Ruby boolean value automatically.
-      self.call(sym_str[0..-2].to_sym, *args, &block) == JS::True
+      result = self.call(sym_str[0..-2].to_sym, *args, &block)
+
+      # Type coerce the result to boolean type
+      # to match the true/false determination in JavaScript's if statement.
+      JS.global.Boolean(result) == JS::True
     elsif self[sym].typeof == "function"
       self.call(sym, *args, &block)
     else
diff --git a/packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb b/packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb
index 13e9bc3f3a..84b2885552 100644
--- a/packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb
+++ b/packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb
@@ -322,7 +322,9 @@ def test_method_missing_with_?
       return {
         return_true() { return true; },
         return_false() { return false; },
-        return_object() { return {}; }
+        return_object() { return {}; },
+        return_null() { return null; },
+        return_empty_string() { return ''; }
       };
     JS
 
@@ -334,8 +336,12 @@ def test_method_missing_with_?
     assert_true object.return_true?
     assert_false object.return_false?
 
-    # Return Ruby false when the return value is not JS::True
-    assert_false object.return_object?
+    # Return Ruby true when the return value is JavaScript true
+    assert_true object.return_object?
+
+    # Return Ruby false when the return value is JavaScript false
+    assert_false object.return_null?
+    assert_false object.return_empty_string?
   end
 
   def test_respond_to_missing?