diff --git a/cmd/aigw/testdata/translate_basic.out.yaml b/cmd/aigw/testdata/translate_basic.out.yaml
index de7fab6673..e030b76651 100644
--- a/cmd/aigw/testdata/translate_basic.out.yaml
+++ b/cmd/aigw/testdata/translate_basic.out.yaml
@@ -182,8 +182,7 @@ metadata:
 spec:
   directResponse:
     body:
-      inline: No matching route found. It is likely that the model specified your
-        request is not configured in the Gateway.
+      inline: No matching route found. It is likely because the model specified in your request is not configured in the Gateway.
       type: null
     statusCode: 404
 ---
diff --git a/internal/controller/ai_gateway_route.go b/internal/controller/ai_gateway_route.go
index 3a0d5ca11e..a29d855af5 100644
--- a/internal/controller/ai_gateway_route.go
+++ b/internal/controller/ai_gateway_route.go
@@ -146,7 +146,7 @@ func generateHTTPRouteFilters(aiGatewayRoute *aigv1a1.AIGatewayRoute) []*egv1a1.
 					Body: &egv1a1.CustomResponseBody{
 						Inline: ptr.To(
 							// "Likely" since the matching rule can be arbitrary, not necessarily matching on the model name.
-							`No matching route found. It is likely that the model specified your request is not configured in the Gateway.`,
+							`No matching route found. It is likely because the model specified in your request is not configured in the Gateway.`,
 						),
 					},
 				},
diff --git a/tests/e2e/testupstream_test.go b/tests/e2e/testupstream_test.go
index be2c49a9fa..2e6a0efe7b 100644
--- a/tests/e2e/testupstream_test.go
+++ b/tests/e2e/testupstream_test.go
@@ -83,7 +83,7 @@ func TestWithTestUpstream(t *testing.T) {
 				name:            "openai",
 				modelName:       "non-existent-model",
 				expStatus:       404,
-				expResponseBody: `No matching route found. It is likely that the model specified your request is not configured in the Gateway.`,
+				expResponseBody: `No matching route found. It is likely because the model specified in your request is not configured in the Gateway.`,
 			},
 			{
 				name:               "openai-header-mutation",