diff --git a/sys/dev/isp/isp_pci.c b/sys/dev/isp/isp_pci.c
index 7c01f860125..7935a241d77 100644
--- a/sys/dev/isp/isp_pci.c
+++ b/sys/dev/isp/isp_pci.c
@@ -303,7 +303,7 @@ isp_pci_attach(device_t dev)
 	struct ispsoftc *isp = NULL;
 	struct ispmdvec *mdvp;
 	bus_size_t lim;
-	char *sptr;
+	const char *sptr;
 	int locksetup = 0;
 
 	/*