diff --git a/MANIFEST.in b/MANIFEST.in
index b230cd032ee..b6370c24771 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -25,6 +25,7 @@ prune */.ipynb_checkpoints
 prune **/*/README*
 prune bazel-*
 prune grpc-client
+prune tools
 
 # Patterns to exclude from any directory
 global-exclude *.py[cod]