diff --git a/src/nvim/lib/kvec.h b/src/nvim/lib/kvec.h
index ee1b890cb9..ad56c9237b 100644
--- a/src/nvim/lib/kvec.h
+++ b/src/nvim/lib/kvec.h
@@ -41,6 +41,7 @@
 #include <string.h>
 
 #include "nvim/memory.h"
+#include "nvim/os/os_defs.h"
 
 #define kv_roundup32(x) \
     ((--(x)), \