1 files changed, 1 insertions, 1 deletions
diff --git a/src/files_map.adb b/src/files_map.adb
index a86809b01..1d9a5c7b8 100644
--- a/src/files_map.adb
+++ b/src/files_map.adb
@@ -544,7 +544,7 @@ package body Files_Map is
       P := Filename'Last;
       E := Ext'Last;
       loop
-         if P >= Filename'First
+         if P <= Filename'First
            or else E < Ext'First
          then
             return Language_Unknown;