diff --git a/sdk/azcore/go.mod b/sdk/azcore/go.mod
index ec27d70613a8..43f02e35b149 100644
--- a/sdk/azcore/go.mod
+++ b/sdk/azcore/go.mod
@@ -1,5 +1,5 @@
 module github.com/Azure/azure-sdk-for-go/sdk/azcore
 
-require github.com/Azure/azure-sdk-for-go/sdk/internal v0.2.0
+require github.com/Azure/azure-sdk-for-go/sdk/internal v0.2.1
 
 go 1.13
diff --git a/sdk/azcore/go.sum b/sdk/azcore/go.sum
index b720d8ab5281..fcadc4a55998 100644
--- a/sdk/azcore/go.sum
+++ b/sdk/azcore/go.sum
@@ -1,2 +1,2 @@
-github.com/Azure/azure-sdk-for-go/sdk/internal v0.2.0 h1:cLpVMIkXC/umSP9DMz9I6FttDWJAsmvhpaB6MlkagGY=
-github.com/Azure/azure-sdk-for-go/sdk/internal v0.2.0/go.mod h1:Q+TCQnSr+clUU0JU+xrHZ3slYCxw17AOFdvWFpQXjAY=
+github.com/Azure/azure-sdk-for-go/sdk/internal v0.2.1 h1:xY9/wUJ8PcxmTEJ6z+0qKuj9rb3Aw9nhiL+ik5evR/g=
+github.com/Azure/azure-sdk-for-go/sdk/internal v0.2.1/go.mod h1:Q+TCQnSr+clUU0JU+xrHZ3slYCxw17AOFdvWFpQXjAY=
diff --git a/sdk/azcore/response_test.go b/sdk/azcore/response_test.go
index f4b1324dc971..72b404ae0f5a 100644
--- a/sdk/azcore/response_test.go
+++ b/sdk/azcore/response_test.go
@@ -128,8 +128,8 @@ func TestRetryAfter(t *testing.T) {
 		t.Fatal("expected retry-after value from date")
 	}
 	// d will not be exactly 600 seconds but it will be close
-	if d/time.Second != 599 {
-		t.Fatalf("expected ~600 seconds, got %d", d/time.Second)
+	if s := d / time.Second; s < 598 || s > 602 {
+		t.Fatalf("expected ~600 seconds, got %d", s)
 	}
 }