diff --git a/flipt-client-node/src/evaluation.test.ts b/flipt-client-node/src/evaluation.test.ts
index 4a90732b..f749962f 100644
--- a/flipt-client-node/src/evaluation.test.ts
+++ b/flipt-client-node/src/evaluation.test.ts
@@ -61,7 +61,7 @@ test('variant failure', () => {
   expect(variant.result).toBeNull();
   expect(variant.status).toEqual('failure');
   expect(variant.error_message).toEqual(
-    'failed to get flag information default/nonexistent'
+    'invalid request: failed to get flag information default/nonexistent'
   );
 });
 
@@ -78,6 +78,6 @@ test('boolean failure', () => {
   expect(boolean.result).toBeNull();
   expect(boolean.status).toEqual('failure');
   expect(boolean.error_message).toEqual(
-    'failed to get flag information default/nonexistent'
+    'invalid request: failed to get flag information default/nonexistent'
   );
 });
diff --git a/flipt-client-python/tests/__init__.py b/flipt-client-python/tests/__init__.py
index 1af31ba6..72cff4ef 100644
--- a/flipt-client-python/tests/__init__.py
+++ b/flipt-client-python/tests/__init__.py
@@ -46,7 +46,8 @@ def test_failure_variant(self):
         )
         self.assertIsNone(variant.result)
         self.assertEqual(
-            variant.error_message, "failed to get flag information default/nonexistent"
+            variant.error_message,
+            "invalid request: failed to get flag information default/nonexistent",
         )
         self.assertEqual("failure", variant.status)
 
@@ -56,7 +57,8 @@ def test_failure_boolean(self):
         )
         self.assertIsNone(boolean.result)
         self.assertEqual(
-            boolean.error_message, "failed to get flag information default/nonexistent"
+            boolean.error_message,
+            "invalid request: failed to get flag information default/nonexistent",
         )
         self.assertEqual("failure", boolean.status)
 
diff --git a/flipt-client-ruby/spec/evaluation_spec.rb b/flipt-client-ruby/spec/evaluation_spec.rb
index 18457697..48b7ef95 100644
--- a/flipt-client-ruby/spec/evaluation_spec.rb
+++ b/flipt-client-ruby/spec/evaluation_spec.rb
@@ -50,7 +50,7 @@
       expect(resp).to_not be_nil
       expect(resp['result']).to be_nil
       expect(resp['status']).to eq('failure')
-      expect(resp['error_message']).to eq('failed to get flag information default/nonexistent')
+      expect(resp['error_message']).to eq('invalid request: failed to get flag information default/nonexistent')
     end
   end
 
@@ -65,7 +65,7 @@
       expect(resp).to_not be_nil
       expect(resp['result']).to be_nil
       expect(resp['status']).to eq('failure')
-      expect(resp['error_message']).to eq('failed to get flag information default/nonexistent')
+      expect(resp['error_message']).to eq('invalid request: failed to get flag information default/nonexistent')
     end
   end
 end