diff --git a/src/import/import-common.c b/src/import/import-common.c
index 2fb781442a..28a913fdb7 100644
--- a/src/import/import-common.c
+++ b/src/import/import-common.c
@@ -2,6 +2,7 @@
 
 #include <sched.h>
 #include <sys/prctl.h>
+#include <unistd.h>
 
 #include "sd-event.h"