diff --git a/.gitignore b/.gitignore
index 9b9d883742f3..e354a3df9b96 100644
--- a/.gitignore
+++ b/.gitignore
@@ -63,6 +63,7 @@ book/
 
 # rust
 /rust/target/
+/synapse/*.so
 
 # Poetry will create a setup.py, which we don't want to include.
 /setup.py