diff --git a/ide/debugmanager.pas b/ide/debugmanager.pas
index d8ea5c008c..5f534c650e 100644
--- a/ide/debugmanager.pas
+++ b/ide/debugmanager.pas
@@ -582,8 +582,10 @@ var
   OpenDialog: TOpenDialog;
   AnUnitInfo: TLazProjectFile;
 begin
-  Result:=False;
+  Result := False;
   if Destroying then exit;
+  Result := FilenameIsAbsolute(Filename);
+  if Result then exit;
 
   // some debuggers (e.g. gdb) sometimes returns linux path delims under windows
   // => fix that