diff --git a/appveyor.yml b/appveyor.yml
index de63e8fd72..742279ca4f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -13,7 +13,7 @@ environment:
   METEOR_PRETTY_OUTPUT: 0
   SELF_TEST_TOOL_NODE_FLAGS: " "
   TOOL_NODE_FLAGS: --expose-gc
-  TIMEOUT_SCALE_FACTOR: 8
+  TIMEOUT_SCALE_FACTOR: 10
   METEOR_HEADLESS: true
   SELF_TEST_EXCLUDE: "^NULL-LEAVE-THIS-HERE-NULL$"
 platform: