diff --git a/modules/hostmatcher/hostmatcher.go b/modules/hostmatcher/hostmatcher.go
index a95557def1a4..f8a787c575e3 100644
--- a/modules/hostmatcher/hostmatcher.go
+++ b/modules/hostmatcher/hostmatcher.go
@@ -35,7 +35,7 @@ const MatchBuiltinLoopback = "loopback"
 func ParseHostMatchList(hostList string) *HostMatchList {
 	hl := &HostMatchList{}
 	for _, s := range strings.Split(hostList, ",") {
-		s = strings.TrimSpace(s)
+		s = strings.ToLower(strings.TrimSpace(s))
 		if s == "" {
 			continue
 		}
@@ -52,6 +52,7 @@ func ParseHostMatchList(hostList string) *HostMatchList {
 // MatchesHostOrIP checks if the host or IP matches an allow/deny(block) list
 func (hl *HostMatchList) MatchesHostOrIP(host string, ip net.IP) bool {
 	var matched bool
+	host = strings.ToLower(host)
 	ipStr := ip.String()
 loop:
 	for _, hostInList := range hl.hosts {
diff --git a/modules/hostmatcher/hostmatcher_test.go b/modules/hostmatcher/hostmatcher_test.go
index e9c8f68dc6f6..8eaafbdbc809 100644
--- a/modules/hostmatcher/hostmatcher_test.go
+++ b/modules/hostmatcher/hostmatcher_test.go
@@ -20,7 +20,7 @@ func TestHostOrIPMatchesList(t *testing.T) {
 
 	// for IPv6: "::1" is loopback, "fd00::/8" is private
 
-	hl := ParseHostMatchList("private, external, *.mydomain.com, 169.254.1.0/24")
+	hl := ParseHostMatchList("private, External, *.myDomain.com, 169.254.1.0/24")
 	cases := []tc{
 		{"", net.IPv4zero, false},
 		{"", net.IPv6zero, false},