diff --git a/internal/alertmanager/models.go b/internal/alertmanager/models.go
index 1f727c9e0..512361fbd 100644
--- a/internal/alertmanager/models.go
+++ b/internal/alertmanager/models.go
@@ -4,13 +4,11 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
-	"path"
 	"sort"
 	"strings"
 	"sync"
 	"time"
 
-	"github.com/prymitive/karma/internal/config"
 	"github.com/prymitive/karma/internal/filters"
 	"github.com/prymitive/karma/internal/mapper"
 	"github.com/prymitive/karma/internal/models"
@@ -183,11 +181,7 @@ func (am *Alertmanager) pullSilences(version string) error {
 // InternalURI is the URI of this Alertmanager that will be used for all request made by the UI
 func (am *Alertmanager) InternalURI() string {
 	if am.ProxyRequests {
-		sub := fmt.Sprintf("/proxy/alertmanager/%s", am.Name)
-		if strings.HasPrefix(config.Config.Listen.Prefix, "/") {
-			return path.Join(config.Config.Listen.Prefix, sub)
-		}
-		return path.Join("/"+config.Config.Listen.Prefix, sub)
+		return fmt.Sprintf("./proxy/alertmanager/%s", am.Name)
 	}
 
 	// strip all user/pass information, fetch() doesn't support it anyway
diff --git a/internal/alertmanager/models_test.go b/internal/alertmanager/models_test.go
index f6a118a37..0fbb12c36 100644
--- a/internal/alertmanager/models_test.go
+++ b/internal/alertmanager/models_test.go
@@ -33,13 +33,13 @@ var uriTests = []uriTest{
 	{
 		rawURI:      "http://alertmanager.example.com",
 		proxy:       true,
-		internalURI: "/proxy/alertmanager/test",
+		internalURI: "./proxy/alertmanager/test",
 		publicURI:   "http://alertmanager.example.com",
 	},
 	{
 		rawURI:      "http://alertmanager.example.com/foo",
 		proxy:       true,
-		internalURI: "/proxy/alertmanager/test",
+		internalURI: "./proxy/alertmanager/test",
 		publicURI:   "http://alertmanager.example.com/foo",
 	},
 	{
@@ -57,21 +57,21 @@ var uriTests = []uriTest{
 	{
 		rawURI:      "http://user:pass@alertmanager.example.com",
 		proxy:       true,
-		internalURI: "/proxy/alertmanager/test",
+		internalURI: "./proxy/alertmanager/test",
 		publicURI:   "http://user:pass@alertmanager.example.com",
 	},
 	{
 		rawURI:      "http://user:pass@alertmanager.example.com",
 		extURI:      "http://am.example.com",
 		proxy:       true,
-		internalURI: "/proxy/alertmanager/test",
+		internalURI: "./proxy/alertmanager/test",
 		publicURI:   "http://am.example.com",
 	},
 	{
 		rawURI:      "http://alertmanager.example.com",
 		extURI:      "http://am.example.com",
 		proxy:       true,
-		internalURI: "/proxy/alertmanager/test",
+		internalURI: "./proxy/alertmanager/test",
 		publicURI:   "http://am.example.com",
 	},
 	{
@@ -134,27 +134,27 @@ func TestAlertmanagerInternalURI(t *testing.T) {
 		{
 			prefix: "/",
 			proxy:  true,
-			uri:    "/proxy/alertmanager/default",
+			uri:    "./proxy/alertmanager/default",
 		},
 		{
 			prefix: "/root",
 			proxy:  true,
-			uri:    "/root/proxy/alertmanager/default",
+			uri:    "./proxy/alertmanager/default",
 		},
 		{
 			prefix: "/root/",
 			proxy:  true,
-			uri:    "/root/proxy/alertmanager/default",
+			uri:    "./proxy/alertmanager/default",
 		},
 		{
 			prefix: "root",
 			proxy:  true,
-			uri:    "/root/proxy/alertmanager/default",
+			uri:    "./proxy/alertmanager/default",
 		},
 		{
 			prefix: "root/",
 			proxy:  true,
-			uri:    "/root/proxy/alertmanager/default",
+			uri:    "./proxy/alertmanager/default",
 		},
 	}