diff --git a/main/pbx.c b/main/pbx.c
index e0608ae305..6cbe7cfff5 100644
--- a/main/pbx.c
+++ b/main/pbx.c
@@ -1477,7 +1477,7 @@ static int ext_cmp1(const char **p)
 		;	/* ignore some characters */
 
 	/* always return unless we have a set of chars */
-	switch (c) {
+	switch (toupper(c)) {
 	default:	/* ordinary character */
 		return 0x0000 | (c & 0xff);