diff --git a/dlls/setupapi/devinst.c b/dlls/setupapi/devinst.c
index 778c66c9d65..37a73024352 100644
--- a/dlls/setupapi/devinst.c
+++ b/dlls/setupapi/devinst.c
@@ -351,7 +351,7 @@ BOOL WINAPI SetupDiClassGuidsFromNameExA(
     if (ClassNameW == NULL)
         return FALSE;
 
-    if (MachineNameW)
+    if (MachineName)
     {
         MachineNameW = MultiByteToUnicode(MachineName, CP_ACP);
         if (MachineNameW == NULL)