diff --git a/TEST/ProxyGen.Tests/Generators/DuckGenerator.cs b/TEST/ProxyGen.Tests/Generators/DuckGenerator.cs
index d270c3a1..9c6dd49e 100644
--- a/TEST/ProxyGen.Tests/Generators/DuckGenerator.cs
+++ b/TEST/ProxyGen.Tests/Generators/DuckGenerator.cs
@@ -234,7 +234,7 @@ public void DuckGenerator_ShouldCacheTheGeneratedAssemblyIfCacheDirectoryIsSet()
             string tmpDir = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "tmp");
             Directory.CreateDirectory(tmpDir);
 
-            string cacheFile = Path.Combine(tmpDir, generator.TypeResolutionStrategy.AssemblyName);
+            string cacheFile = Path.Combine(tmpDir, $"{generator.TypeResolutionStrategy.AssemblyName}.dll");
 
             if (File.Exists(cacheFile))
                 File.Delete(cacheFile);
@@ -253,7 +253,7 @@ public void DuckGenerator_ShouldUseTheCachedAssemblyIfTheCacheDirectoryIsSet()
 
             string
                 cacheDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location),
-                cacheFile = Path.Combine(cacheDir, generator.TypeResolutionStrategy.AssemblyName);
+                cacheFile = Path.Combine(cacheDir, $"{generator.TypeResolutionStrategy.AssemblyName}.dll");
          
             ((RuntimeCompiledTypeResolutionStrategy) generator.TypeResolutionStrategy).CacheDir = cacheDir;
 
diff --git a/TEST/ProxyGen.Tests/Generators/ProxyGenerator.cs b/TEST/ProxyGen.Tests/Generators/ProxyGenerator.cs
index 3b3d349c..8883bf2b 100644
--- a/TEST/ProxyGen.Tests/Generators/ProxyGenerator.cs
+++ b/TEST/ProxyGen.Tests/Generators/ProxyGenerator.cs
@@ -460,7 +460,7 @@ public void ProxyGenerator_ShouldCacheTheGeneratedAssemblyIfCacheDirectoryIsSet(
             string tmpDir = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "tmp");
             Directory.CreateDirectory(tmpDir);
 
-            string cacheFile = Path.Combine(tmpDir, generator.TypeResolutionStrategy.AssemblyName);
+            string cacheFile = Path.Combine(tmpDir, $"{generator.TypeResolutionStrategy.AssemblyName}.dll");
 
             if (File.Exists(cacheFile))
                 File.Delete(cacheFile);
@@ -480,7 +480,7 @@ public void ProxyGenerator_ShouldUseTheCachedAssemblyIfTheCacheDirectoryIsSet()
                 cacheDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location),
                 cacheFile = Path.Combine(
                     cacheDir,
-                    generator.TypeResolutionStrategy.AssemblyName);
+                    $"{generator.TypeResolutionStrategy.AssemblyName}.dll");
 
             ((RuntimeCompiledTypeResolutionStrategy) generator.TypeResolutionStrategy).CacheDir = cacheDir;
             Type gt = generator.TypeResolutionStrategy.Resolve();