diff --git a/ApprovalTests/Namers/AssemblyLocationNamer.cs b/ApprovalTests/Namers/AssemblyLocationNamer.cs
new file mode 100644
index 00000000..a95cbfcc
--- /dev/null
+++ b/ApprovalTests/Namers/AssemblyLocationNamer.cs
@@ -0,0 +1,23 @@
+using System;
+using System.IO;
+using System.Reflection;
+
+namespace ApprovalTests.Namers
+{
+    public class AssemblyLocationNamer : UnitTestFrameworkNamer
+    {
+        private string AssemblyDirectory
+        {
+            get
+            {
+                // CodeBase is used because the NUnit test runner is otherwise quirky
+                var codeBase = Assembly.GetExecutingAssembly().CodeBase;
+                var uri = new UriBuilder(codeBase);
+                var path = Uri.UnescapeDataString(uri.Path);
+                return Path.GetDirectoryName(path);
+            }
+        }
+
+        public override string SourcePath => AssemblyDirectory + GetSubdirectory();
+    }
+}
\ No newline at end of file
diff --git a/ApprovalTests/Namers/UnitTestFrameworkNamer.cs b/ApprovalTests/Namers/UnitTestFrameworkNamer.cs
index 6c77c689..9a44ae83 100644
--- a/ApprovalTests/Namers/UnitTestFrameworkNamer.cs
+++ b/ApprovalTests/Namers/UnitTestFrameworkNamer.cs
@@ -28,7 +28,7 @@ private void HandleSubdirectory()
 
         public string Name => stackTraceParser.ApprovalName;
 
-        public string SourcePath => stackTraceParser.SourcePath + GetSubdirectory();
+        public virtual string SourcePath => stackTraceParser.SourcePath + GetSubdirectory();
 
         public string GetSubdirectory()
         {