diff --git a/hw/pci-shmem.c b/hw/pci-shmem.c
index 00e5d93..ec3f771 100644
--- a/hw/pci-shmem.c
+++ b/hw/pci-shmem.c
@@ -356,7 +356,7 @@ int pci_shmem__init(struct kvm *kvm)
 	char *mem;
 	int r;
 
-	if (shmem_region == 0)
+	if (shmem_region == NULL)
 		return 0;
 
 	/* Register good old INTx */