diff --git a/lib/libpmc/pmu-events/jevents.c b/lib/libpmc/pmu-events/jevents.c
index e5e81d208857..1526f75cf714 100644
--- a/lib/libpmc/pmu-events/jevents.c
+++ b/lib/libpmc/pmu-events/jevents.c
@@ -122,7 +122,7 @@ static void fixdesc(char *s)
 	--e;
 	while (e >= s && isspace(*e))
 		--e;
-	if (*e == '.')
+	if (e >= s && *e == '.')
 		*e = 0;
 }