diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c
index f3542cb2cf..f2dcc01e27 100644
--- a/pc-bios/s390-ccw/netmain.c
+++ b/pc-bios/s390-ccw/netmain.c
@@ -269,6 +269,7 @@ static const char *get_uuid(void)
                  : "d" (r0), "d" (r1), [addr] "a" (buf)
                  : "cc", "memory");
     if (cc) {
+        free(mem);
         return NULL;
     }