diff --git a/.hgignore b/.hgignore
index 9d3df377e..d12f6915b 100644
--- a/.hgignore
+++ b/.hgignore
@@ -126,3 +126,4 @@ clonk.cbp
 # MacOSX saved searches
 *.savedSearch
 planet/OpenClonk.bat
+planet/openclonk.sln