diff --git a/tests/utils/dotest.pp b/tests/utils/dotest.pp
index 8cc55c0b10..6f49bdf73f 100644
--- a/tests/utils/dotest.pp
+++ b/tests/utils/dotest.pp
@@ -1613,6 +1613,8 @@ procedure getargs;
 
      'L' : begin
              UniqueSuffix:=Para;
+             if UniqueSuffix='' then
+               UniqueSuffix:=toStr(system.GetProcessID);
            end;
 
      'M' : EmulatorName:=Para;