diff --git a/block.c b/block.c
index 48305b7..1db8473 100644
--- a/block.c
+++ b/block.c
@@ -290,13 +290,13 @@ static BlockDriver *find_protocol(const char *filename)
 
     /* TODO Drivers without bdrv_file_open must be specified explicitly */
 
+    p = strchr(filename, ':');
+    if (!p ||
 #ifdef _WIN32
-    if (is_windows_drive(filename) ||
+        is_windows_drive(filename) ||
         is_windows_drive_prefix(filename))
-        return bdrv_find_format("file");
 #endif
-    p = strchr(filename, ':');
-    if (!p) {
+    {
         drv1 = find_hdev_driver(filename);
         if (!drv1) {
             drv1 = bdrv_find_format("file");