diff --git a/tests/virpcimock.c b/tests/virpcimock.c
index c9f704f2c7b47f31cebfb2b18e9eddc60ae07836..3577d1bd41250e23ea5fc835b69ceb621f58017b 100644
--- a/tests/virpcimock.c
+++ b/tests/virpcimock.c
@@ -121,7 +121,7 @@ struct pciDriver {
 };
 
 struct pciDevice {
-    char *id;
+    const char *id;
     int vendor;
     int device;
     int klass;
@@ -880,7 +880,7 @@ init_env(void)
 
 # define MAKE_PCI_DEVICE(Id, Vendor, Device, ...) \
     do { \
-        struct pciDevice dev = {.id = (char *)Id, .vendor = Vendor, \
+        struct pciDevice dev = {.id = Id, .vendor = Vendor, \
                                 .device = Device, __VA_ARGS__}; \
         pci_device_new_from_stub(&dev); \
     } while (0)