diff --git a/main.go b/main.go
index ece1b0290..21e196464 100644
--- a/main.go
+++ b/main.go
@@ -134,7 +134,7 @@ func main() {
 		CFUsername:                     cfg.CFUsername,
 		CFPassword:                     cfg.CFPassword,
 		ContourLoadBalancerService:     cfg.ContourLoadBalancerService,
-		GlooNamespace:                  cfg.GlooNamespace,
+		GlooNamespaces:                 cfg.GlooNamespaces,
 		SkipperRouteGroupVersion:       cfg.SkipperRouteGroupVersion,
 		RequestTimeout:                 cfg.RequestTimeout,
 		DefaultTargets:                 cfg.DefaultTargets,
diff --git a/pkg/apis/externaldns/types.go b/pkg/apis/externaldns/types.go
index 9e58b9410..4ebaf3e50 100644
--- a/pkg/apis/externaldns/types.go
+++ b/pkg/apis/externaldns/types.go
@@ -48,7 +48,7 @@ type Config struct {
 	RequestTimeout                    time.Duration
 	DefaultTargets                    []string
 	ContourLoadBalancerService        string
-	GlooNamespace                     string
+	GlooNamespaces                    []string
 	SkipperRouteGroupVersion          string
 	Sources                           []string
 	Namespace                         string
@@ -207,7 +207,7 @@ var defaultConfig = &Config{
 	RequestTimeout:              time.Second * 30,
 	DefaultTargets:              []string{},
 	ContourLoadBalancerService:  "heptio-contour/contour",
-	GlooNamespace:               "gloo-system",
+	GlooNamespaces:              []string{"gloo-system"},
 	SkipperRouteGroupVersion:    "zalando.org/v1",
 	Sources:                     nil,
 	Namespace:                   "",
@@ -398,7 +398,7 @@ func (cfg *Config) ParseFlags(args []string) error {
 	app.Flag("contour-load-balancer", "The fully-qualified name of the Contour load balancer service. (default: heptio-contour/contour)").Default("heptio-contour/contour").StringVar(&cfg.ContourLoadBalancerService)
 
 	// Flags related to Gloo
-	app.Flag("gloo-namespace", "Coma separated list of gloo namespaces. (default: gloo-system)").Default("gloo-system").StringVar(&cfg.GlooNamespace)
+	app.Flag("gloo-namespace", "Set Gloo Proxy namespace; specify multiple times for multiple namespaces. (default: gloo-system)").Default("gloo-system").StringsVar(&cfg.GlooNamespaces)
 
 	// Flags related to Skipper RouteGroup
 	app.Flag("skipper-routegroup-groupversion", "The resource version for skipper routegroup").Default(source.DefaultRoutegroupVersion).StringVar(&cfg.SkipperRouteGroupVersion)
diff --git a/pkg/apis/externaldns/types_test.go b/pkg/apis/externaldns/types_test.go
index efa2df6ea..fa7567bdf 100644
--- a/pkg/apis/externaldns/types_test.go
+++ b/pkg/apis/externaldns/types_test.go
@@ -36,7 +36,7 @@ var (
 		KubeConfig:                  "",
 		RequestTimeout:              time.Second * 30,
 		ContourLoadBalancerService:  "heptio-contour/contour",
-		GlooNamespace:               "gloo-system",
+		GlooNamespaces:              []string{"gloo-system"},
 		SkipperRouteGroupVersion:    "zalando.org/v1",
 		Sources:                     []string{"service"},
 		Namespace:                   "",
@@ -136,7 +136,7 @@ var (
 		KubeConfig:                  "/some/path",
 		RequestTimeout:              time.Second * 77,
 		ContourLoadBalancerService:  "heptio-contour-other/contour-other",
-		GlooNamespace:               "gloo-not-system,gloo-second-system",
+		GlooNamespaces:              []string{"gloo-not-system", "gloo-second-system"},
 		SkipperRouteGroupVersion:    "zalando.org/v2",
 		Sources:                     []string{"service", "ingress", "connector"},
 		Namespace:                   "namespace",
@@ -266,7 +266,8 @@ func TestParseFlags(t *testing.T) {
 				"--kubeconfig=/some/path",
 				"--request-timeout=77s",
 				"--contour-load-balancer=heptio-contour-other/contour-other",
-				"--gloo-namespace=gloo-not-system,gloo-second-system",
+				"--gloo-namespace=gloo-not-system",
+				"--gloo-namespace=gloo-second-system",
 				"--skipper-routegroup-groupversion=zalando.org/v2",
 				"--source=service",
 				"--source=ingress",
@@ -391,7 +392,7 @@ func TestParseFlags(t *testing.T) {
 				"EXTERNAL_DNS_KUBECONFIG":                      "/some/path",
 				"EXTERNAL_DNS_REQUEST_TIMEOUT":                 "77s",
 				"EXTERNAL_DNS_CONTOUR_LOAD_BALANCER":           "heptio-contour-other/contour-other",
-				"EXTERNAL_DNS_GLOO_NAMESPACE":                  "gloo-not-system,gloo-second-system",
+				"EXTERNAL_DNS_GLOO_NAMESPACE":                  "gloo-not-system\ngloo-second-system",
 				"EXTERNAL_DNS_SKIPPER_ROUTEGROUP_GROUPVERSION": "zalando.org/v2",
 				"EXTERNAL_DNS_SOURCE":                          "service\ningress\nconnector",
 				"EXTERNAL_DNS_NAMESPACE":                       "namespace",
diff --git a/source/gloo_proxy.go b/source/gloo_proxy.go
index 37d940125..cf2ae2cd5 100644
--- a/source/gloo_proxy.go
+++ b/source/gloo_proxy.go
@@ -85,11 +85,12 @@ type glooSource struct {
 }
 
 // NewGlooSource creates a new glooSource with the given config
-func NewGlooSource(dynamicKubeClient dynamic.Interface, kubeClient kubernetes.Interface, glooNamespaces string) (Source, error) {
+func NewGlooSource(dynamicKubeClient dynamic.Interface, kubeClient kubernetes.Interface,
+	glooNamespaces []string) (Source, error) {
 	return &glooSource{
 		dynamicKubeClient,
 		kubeClient,
-		strings.Split(glooNamespaces, ","),
+		glooNamespaces,
 	}, nil
 }
 
diff --git a/source/gloo_proxy_test.go b/source/gloo_proxy_test.go
index c1005fec2..450f89e5d 100644
--- a/source/gloo_proxy_test.go
+++ b/source/gloo_proxy_test.go
@@ -220,7 +220,7 @@ func TestGlooSource(t *testing.T) {
 			proxyGVR: "ProxyList",
 		})
 
-	source, err := NewGlooSource(fakeDynamicClient, fakeKubernetesClient, defaultGlooNamespace)
+	source, err := NewGlooSource(fakeDynamicClient, fakeKubernetesClient, []string{defaultGlooNamespace})
 	assert.NoError(t, err)
 	assert.NotNil(t, source)
 
diff --git a/source/store.go b/source/store.go
index 87ba403a2..fd4690d8e 100644
--- a/source/store.go
+++ b/source/store.go
@@ -67,7 +67,7 @@ type Config struct {
 	CFUsername                     string
 	CFPassword                     string
 	ContourLoadBalancerService     string
-	GlooNamespace                  string
+	GlooNamespaces                 []string
 	SkipperRouteGroupVersion       string
 	RequestTimeout                 time.Duration
 	DefaultTargets                 []string
@@ -288,7 +288,7 @@ func BuildWithConfig(ctx context.Context, source string, p ClientGenerator, cfg
 		if err != nil {
 			return nil, err
 		}
-		return NewGlooSource(dynamicClient, kubernetesClient, cfg.GlooNamespace)
+		return NewGlooSource(dynamicClient, kubernetesClient, cfg.GlooNamespaces)
 	case "openshift-route":
 		ocpClient, err := p.OpenShiftClient()
 		if err != nil {