diff --git a/gtk/gtkapplication.c b/gtk/gtkapplication.c
index 46540ab5ee..ea5211b211 100644
--- a/gtk/gtkapplication.c
+++ b/gtk/gtkapplication.c
@@ -23,7 +23,11 @@
 #include "gtkapplication.h"
 
 #include <stdlib.h>
+
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
+
 #include <string.h>
 
 #include "gtkapplicationprivate.h"