diff --git a/perf/cairo-perf-diff-files.c b/perf/cairo-perf-diff-files.c
index a04014caa..056d7ece9 100644
--- a/perf/cairo-perf-diff-files.c
+++ b/perf/cairo-perf-diff-files.c
@@ -314,7 +314,7 @@ cairo_perf_reports_compare (cairo_perf_report_t		*reports,
 	diff++;
 	num_diffs++;
     }
-    if (num_diffs < 2)
+    if (num_diffs == 0)
 	goto DONE;
 
     if (num_reports == 2)