diff --git a/Acoustics/Acoustics.Test/Shared/ConfigFileTests.cs b/Acoustics/Acoustics.Test/Shared/ConfigFileTests.cs
index 97a55fc2e..b971d1444 100644
--- a/Acoustics/Acoustics.Test/Shared/ConfigFileTests.cs
+++ b/Acoustics/Acoustics.Test/Shared/ConfigFileTests.cs
@@ -131,9 +131,9 @@ public void TheResolveMethodThrowsForBadInput()
         {
             Assert.Throws<ConfigFileException>(() => { ConfigFile.ResolveConfigFile("   "); });
 
-            Assert.Throws<ConfigFileException>(() => { ConfigFile.ResolveConfigFile(string.Empty); });
+            Assert.Throws<ArgumentException>(() => { ConfigFile.ResolveConfigFile(string.Empty); });
 
-            Assert.Throws<ConfigFileException>(() => { ConfigFile.ResolveConfigFile((string)null); });
+            Assert.Throws<ArgumentException>(() => { ConfigFile.ResolveConfigFile((string)null); });
 
             Assert.Throws<ArgumentNullException>(() => { ConfigFile.ResolveConfigFile((FileInfo)null); });
         }