diff --git a/Tests/EndToEndTests/CNTKv2Python/Examples/testcases.yml b/Tests/EndToEndTests/CNTKv2Python/Examples/testcases.yml
index fae002bec..6136e3c1d 100644
--- a/Tests/EndToEndTests/CNTKv2Python/Examples/testcases.yml
+++ b/Tests/EndToEndTests/CNTKv2Python/Examples/testcases.yml
@@ -1,8 +1,8 @@
 dataDir: .
 
 tags:
-    - bvt-l (build_sku == 'gpu') and (flavor == 'release')
-    - nightly-l (build_sku == 'gpu') and (flavor == 'release')
+    - bvt-l (build_sku == 'gpu') and (flavor == 'release') and (os == 'linux')
+    - nightly-l (build_sku == 'gpu') and (flavor == 'release') and (os == 'linux')
 
 testCases:
   Run must finish with error code 0 (outputs __COMPLETED__ in that case):
diff --git a/Tests/EndToEndTests/CNTKv2Python/ModuleTests/testcases.yml b/Tests/EndToEndTests/CNTKv2Python/ModuleTests/testcases.yml
index fae002bec..6136e3c1d 100644
--- a/Tests/EndToEndTests/CNTKv2Python/ModuleTests/testcases.yml
+++ b/Tests/EndToEndTests/CNTKv2Python/ModuleTests/testcases.yml
@@ -1,8 +1,8 @@
 dataDir: .
 
 tags:
-    - bvt-l (build_sku == 'gpu') and (flavor == 'release')
-    - nightly-l (build_sku == 'gpu') and (flavor == 'release')
+    - bvt-l (build_sku == 'gpu') and (flavor == 'release') and (os == 'linux')
+    - nightly-l (build_sku == 'gpu') and (flavor == 'release') and (os == 'linux')
 
 testCases:
   Run must finish with error code 0 (outputs __COMPLETED__ in that case):