diff --git a/debug/tst-longjmp_chk3.c b/debug/tst-longjmp_chk3.c
index f1562c4b09..34413e1288 100644
--- a/debug/tst-longjmp_chk3.c
+++ b/debug/tst-longjmp_chk3.c
@@ -20,6 +20,7 @@
 #include <signal.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 #include <support/support.h>