diff --git a/code/.gitignore b/code/.gitignore
index 6619b8d..50b4ca9 100644
--- a/code/.gitignore
+++ b/code/.gitignore
@@ -14,6 +14,10 @@ deps/*
 !deps/single_includes/
 !deps/CMakeLists.txt
 
+# macOS iCloud Drive duplicates ("file 2.cpp", "file 2.hpp", …)
+* 2.*
+* 3.*
+
 
 bin