diff --git a/hw/pci-shmem.c b/hw/pci-shmem.c
index ec3f771..701231a 100644
--- a/hw/pci-shmem.c
+++ b/hw/pci-shmem.c
@@ -54,7 +54,7 @@ static struct msix_table msix_table[2];
 
 int pci_shmem__register_mem(struct shmem_info *si)
 {
-	if (shmem_region == NULL) {
+	if (!shmem_region) {
 		shmem_region = si;
 	} else {
 		pr_warning("only single shmem currently avail. ignoring.\n");