diff --git a/.hgignore b/.hgignore
index 2669f46594..998d183309 100644
--- a/.hgignore
+++ b/.hgignore
@@ -18,3 +18,6 @@ lib/NUnit/tools/nunit-console.exe.config
 
 syntax: regexp
 build/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,5}/
+
+# Ignore Roslyn files
+^src/.*\.sln\.ide/
\ No newline at end of file