diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/System/Globalization/RegionInfoTests.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/System/Globalization/RegionInfoTests.cs
index f048a65ede70a..0d86a47933c6f 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/System/Globalization/RegionInfoTests.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/System/Globalization/RegionInfoTests.cs
@@ -272,7 +272,7 @@ public void ValidateThrowingWhenUsingCustomUnspecifiedLcid()
         public void BuiltInRegionListTest()
         {
             // Ensure we can create all region info objects from the built-in list
-            Dictionary<string, string> regionNames = (Dictionary<string, string>)typeof(RegionInfo).Assembly.GetType("System.Globalization.CultureData").GetProperty("RegionNames", BindingFlags.Static | BindingFlags.NonPublic).GetValue(null);
+            Dictionary<string, string> regionNames = (Dictionary<string, string>)Type.GetType("System.Globalization.CultureData, System.Private.CoreLib").GetProperty("RegionNames", BindingFlags.Static | BindingFlags.NonPublic).GetValue(null);
 
             foreach (var kvp in regionNames)
             {