diff --git a/Gemfile.lock b/Gemfile.lock
index b309c755e..0497e8bbf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    xdrgen (0.1.2)
+    xdrgen (0.1.3)
       activesupport (~> 6)
       memoist (~> 0.11.0)
       slop (~> 3.4)
diff --git a/lib/xdrgen/generators/javascript.rb b/lib/xdrgen/generators/javascript.rb
index 178677543..ef388346b 100644
--- a/lib/xdrgen/generators/javascript.rb
+++ b/lib/xdrgen/generators/javascript.rb
@@ -130,12 +130,10 @@ def render_union(out, union)
                 switch = if acase.value.is_a?(AST::Identifier)
                   if union.discriminant.type.is_a?(AST::Typespecs::Int)
                     member = union.resolved_case(acase)
+                    "#{member.value}"
                   else
                     '"' + member_name(acase.value) + '"'
                   end
-                # render integers with a prefix so it's a callable method
-                elsif is_integer?(acase.value.text_value)
-                  '"_' + acase.value.text_value + '"'
                 else
                   acase.value.text_value
                 end
@@ -200,10 +198,6 @@ def member_name(member)
         fixedName
       end
 
-      def is_integer? s
-        true if Integer(s) rescue false
-      end
-
       def reference(type)
         baseReference = case type
         when AST::Typespecs::Bool
diff --git a/lib/xdrgen/version.rb b/lib/xdrgen/version.rb
index 5537011a9..ededcd7da 100644
--- a/lib/xdrgen/version.rb
+++ b/lib/xdrgen/version.rb
@@ -1,3 +1,3 @@
 module Xdrgen
-  VERSION = "0.1.2"
+  VERSION = "0.1.3"
 end
diff --git a/spec/output/generator_spec_javascript/union.x/MyXDR_generated.js b/spec/output/generator_spec_javascript/union.x/MyXDR_generated.js
index fb804d07d..746f767bc 100644
--- a/spec/output/generator_spec_javascript/union.x/MyXDR_generated.js
+++ b/spec/output/generator_spec_javascript/union.x/MyXDR_generated.js
@@ -77,8 +77,8 @@ xdr.union("IntUnion", {
   switchOn: xdr.int(),
   switchName: "type",
   switches: [
-    ["_0", "error"],
-    ["_1", "things"],
+    [0, "error"],
+    [1, "things"],
   ],
   arms: {
     error: xdr.lookup("Error"),