diff --git a/src/linux/prctl.c b/src/linux/prctl.c
index 1f8589e16d0d42d4fec4d48ebce6a9ce59251435..19f4267cdeda4563fae0996b138cca04803746a4 100644
--- a/src/linux/prctl.c
+++ b/src/linux/prctl.c
@@ -9,5 +9,6 @@ int prctl(int op, ...)
 	va_list ap;
 	va_start(ap, op);
 	for (i=0; i<4; i++) x[i] = va_arg(ap, unsigned long);
+	va_end(ap);
 	return syscall(SYS_prctl, op, x[0], x[1], x[2], x[3]);
 }