diff --git a/packages/ProbLog/problog/os.yap b/packages/ProbLog/problog/os.yap
index 7b52ee2a9..e6b7122a5 100644
--- a/packages/ProbLog/problog/os.yap
+++ b/packages/ProbLog/problog/os.yap
@@ -276,7 +276,7 @@ empty_output_directory(Path) :-
 	concat_path_with_filename(Path,'factprobs_*.pl',F2),
 	concat_path_with_filename(Path,'predictions_*.pl',F3),
 	
-	atomic_concat(['rm -f ',F1, ' ', F2, ' ', F3],Command),
+	atomic_concat(['rm -f "', F1, '" "', F2, '" "', F3, '"'],Command),
 	(shell(Command) -> true; true).
 
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