diff --git a/src/nvim/shada.c b/src/nvim/shada.c
index e21c6f17fe..20fe27c370 100644
--- a/src/nvim/shada.c
+++ b/src/nvim/shada.c
@@ -10,7 +10,9 @@
 #include <stdint.h>
 #include <inttypes.h>
 #include <errno.h>
-#include <unistd.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
 #include <assert.h>
 
 #include <msgpack.h>