diff --git a/src/main/geninput/dev-list.c b/src/main/geninput/dev-list.c
index c96f99c..2bfcb4e 100644
--- a/src/main/geninput/dev-list.c
+++ b/src/main/geninput/dev-list.c
@@ -20,7 +20,7 @@ void dev_list_init(struct dev_list *devs, const GUID *class_guid)
     devs->infolist = SetupDiGetClassDevs(
         devs->class_guid, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
 
-    if (devs->infolist == NULL) {
+    if (devs->infolist == INVALID_HANDLE_VALUE) {
         log_fatal(
             "SetupDiGetClassDevs failed: %08x", (unsigned int) GetLastError());
     }
diff --git a/src/main/mm/mm.c b/src/main/mm/mm.c
index 8dd98d0..db543a6 100644
--- a/src/main/mm/mm.c
+++ b/src/main/mm/mm.c
@@ -57,7 +57,7 @@ static HANDLE mm_open_device(void)
     dev_info = SetupDiGetClassDevsW(
         &hid_guid, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
 
-    if (dev_info == NULL) {
+    if (dev_info == INVALID_HANDLE_VALUE) {
         log_fatal("SetupDiGetClassDevs failed");
     }