1 files changed, 5 insertions, 0 deletions
diff --git a/src/os/os.h b/src/os/os.h
index f344f180df..58d49d36e7 100644
--- a/src/os/os.h
+++ b/src/os/os.h
@@ -1,4 +1,9 @@
+#ifndef NEOVIM_OS_H
+#define NEOVIM_OS_H
+
 #include "../vim.h"
 
 long_u mch_total_mem(int special);
 int mch_chdir(char *path);
+
+#endif