diff --git a/kvm-run.c b/kvm-run.c
index 58e2977..d8ef4c9 100644
--- a/kvm-run.c
+++ b/kvm-run.c
@@ -424,6 +424,7 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
 
 	memset(real_cmdline, 0, sizeof(real_cmdline));
 	strcpy(real_cmdline, "notsc noapic noacpi pci=conf1 console=ttyS0 earlyprintk=serial");
+	strcat(real_cmdline, " ");
 	if (kernel_cmdline)
 		strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline));