diff --git a/api/http/handler/endpoints/endpoint_list.go b/api/http/handler/endpoints/endpoint_list.go
index 60ff222a0..cf9bbb69c 100644
--- a/api/http/handler/endpoints/endpoint_list.go
+++ b/api/http/handler/endpoints/endpoint_list.go
@@ -92,12 +92,6 @@ func (handler *Handler) endpointList(w http.ResponseWriter, r *http.Request) *ht
 		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve environment groups from the database", err}
 	}
 
-	// create endpoint groups as a map for more convenient access
-	endpointGroupNames = make(map[portainer.EndpointGroupID]string, 0)
-	for _, group := range endpointGroups {
-		endpointGroupNames[group.ID] = group.Name
-	}
-
 	endpoints, err := handler.DataStore.Endpoint().Endpoints()
 	if err != nil {
 		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve environments from the database", err}
@@ -163,7 +157,7 @@ func (handler *Handler) endpointList(w http.ResponseWriter, r *http.Request) *ht
 	}
 
 	// Sort endpoints by field
-	sortEndpointsByField(filteredEndpoints, sortField, sortOrder == "desc")
+	sortEndpointsByField(filteredEndpoints, endpointGroups, sortField, sortOrder == "desc")
 
 	filteredEndpointCount := len(filteredEndpoints)
 
@@ -260,7 +254,7 @@ func filterEndpointsByStatuses(endpoints []portainer.Endpoint, statuses []int, s
 	return filteredEndpoints
 }
 
-func sortEndpointsByField(endpoints []portainer.Endpoint, sortField string, isSortDesc bool) {
+func sortEndpointsByField(endpoints []portainer.Endpoint, endpointGroups []portainer.EndpointGroup, sortField string, isSortDesc bool) {
 
 	switch sortField {
 	case "Name":
@@ -271,10 +265,20 @@ func sortEndpointsByField(endpoints []portainer.Endpoint, sortField string, isSo
 		}
 
 	case "Group":
+		endpointGroupNames = make(map[portainer.EndpointGroupID]string, 0)
+		for _, group := range endpointGroups {
+			endpointGroupNames[group.ID] = group.Name
+		}
+
+		endpointsByGroup := EndpointsByGroup{
+			endpointGroupNames: endpointGroupNames,
+			endpoints:          endpoints,
+		}
+
 		if isSortDesc {
-			sort.Stable(sort.Reverse(EndpointsByGroup(endpoints)))
+			sort.Stable(sort.Reverse(endpointsByGroup))
 		} else {
-			sort.Stable(EndpointsByGroup(endpoints))
+			sort.Stable(endpointsByGroup)
 		}
 
 	case "Status":
diff --git a/api/http/handler/endpoints/sort.go b/api/http/handler/endpoints/sort.go
index 169188286..1ac5dd11d 100644
--- a/api/http/handler/endpoints/sort.go
+++ b/api/http/handler/endpoints/sort.go
@@ -21,23 +21,26 @@ func (e EndpointsByName) Less(i, j int) bool {
 	return sortorder.NaturalLess(strings.ToLower(e[i].Name), strings.ToLower(e[j].Name))
 }
 
-type EndpointsByGroup []portainer.Endpoint
+type EndpointsByGroup struct {
+	endpointGroupNames map[portainer.EndpointGroupID]string
+	endpoints          []portainer.Endpoint
+}
 
 func (e EndpointsByGroup) Len() int {
-	return len(e)
+	return len(e.endpoints)
 }
 
 func (e EndpointsByGroup) Swap(i, j int) {
-	e[i], e[j] = e[j], e[i]
+	e.endpoints[i], e.endpoints[j] = e.endpoints[j], e.endpoints[i]
 }
 
 func (e EndpointsByGroup) Less(i, j int) bool {
-	if e[i].GroupID == e[j].GroupID {
+	if e.endpoints[i].GroupID == e.endpoints[j].GroupID {
 		return false
 	}
 
-	groupA := endpointGroupNames[e[i].GroupID]
-	groupB := endpointGroupNames[e[j].GroupID]
+	groupA := endpointGroupNames[e.endpoints[i].GroupID]
+	groupB := endpointGroupNames[e.endpoints[j].GroupID]
 
 	return sortorder.NaturalLess(strings.ToLower(groupA), strings.ToLower(groupB))
 }