diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 18dae745034f..f5c3882a1149 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -124,7 +124,7 @@ static char *parse_value(void)
 
 static inline int iskeychar(int c)
 {
-	return isalnum(c) || c == '-' || c == '_';
+	return isalnum(c) || c == '-' || c == '_' || c == '.';
 }
 
 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)