diff --git a/source/nanoFirmwareFlasher/Program.cs b/source/nanoFirmwareFlasher/Program.cs
index 51af29fe..54a7d8f9 100644
--- a/source/nanoFirmwareFlasher/Program.cs
+++ b/source/nanoFirmwareFlasher/Program.cs
@@ -192,7 +192,7 @@ static async Task RunOptionsAndReturnExitCodeAsync(Options o)
                 else if ( 
                     o.ListDevicesInDfuMode ||
                     !string.IsNullOrEmpty(o.DfuDeviceId) ||
-                    o.DfuFile.Any())
+                    !string.IsNullOrEmpty(o.DfuFile))
                 {
                     o.Platform = "stm32";
                 }