diff --git a/src/compile/Component.ts b/src/compile/Component.ts
index aad5e98413..dd41a0a645 100644
--- a/src/compile/Component.ts
+++ b/src/compile/Component.ts
@@ -759,7 +759,7 @@ export default class Component {
 					const { name } = object;
 
 					if (name[0] === '$' && !scope.has(name)) {
-						component.warn_if_undefined(object, null);
+						component.warn_if_undefined(name, object, null);
 					}
 				}
 			},
@@ -1202,9 +1202,7 @@ export default class Component {
 		return `ctx.${name}`;
 	}
 
-	warn_if_undefined(node, template_scope: TemplateScope) {
-		let { name } = node;
-
+	warn_if_undefined(name: string, node, template_scope: TemplateScope) {
 		if (name[0] === '$') {
 			name = name.slice(1);
 			this.has_reactive_assignments = true; // TODO does this belong here?
diff --git a/src/compile/nodes/Action.ts b/src/compile/nodes/Action.ts
index feec3fada8..77b9e3c846 100644
--- a/src/compile/nodes/Action.ts
+++ b/src/compile/nodes/Action.ts
@@ -11,7 +11,7 @@ export default class Action extends Node {
 	constructor(component: Component, parent, scope, info) {
 		super(component, parent, scope, info);
 
-		component.warn_if_undefined(info, scope);
+		component.warn_if_undefined(info.name, info, scope);
 
 		this.name = info.name;
 		component.qualify(info.name);
diff --git a/src/compile/nodes/Animation.ts b/src/compile/nodes/Animation.ts
index 638a88b169..6ccdbb0803 100644
--- a/src/compile/nodes/Animation.ts
+++ b/src/compile/nodes/Animation.ts
@@ -10,7 +10,7 @@ export default class Animation extends Node {
 	constructor(component: Component, parent, scope, info) {
 		super(component, parent, scope, info);
 
-		component.warn_if_undefined(info, scope);
+		component.warn_if_undefined(info.name, info, scope);
 
 		this.name = info.name;
 		component.qualify(info.name);
diff --git a/src/compile/nodes/InlineComponent.ts b/src/compile/nodes/InlineComponent.ts
index 0d8801aad1..3359e981ed 100644
--- a/src/compile/nodes/InlineComponent.ts
+++ b/src/compile/nodes/InlineComponent.ts
@@ -23,8 +23,9 @@ export default class InlineComponent extends Node {
 		super(component, parent, scope, info);
 
 		if (info.name !== 'svelte:component' && info.name !== 'svelte:self') {
-			component.warn_if_undefined(info, scope);
-			component.add_reference(info.name);
+			const name = info.name.split('.')[0]; // accommodate namespaces
+			component.warn_if_undefined(name, info, scope);
+			component.add_reference(name);
 		}
 
 		this.name = info.name;
diff --git a/src/compile/nodes/Transition.ts b/src/compile/nodes/Transition.ts
index c3f22d888e..82eb578f0f 100644
--- a/src/compile/nodes/Transition.ts
+++ b/src/compile/nodes/Transition.ts
@@ -12,7 +12,7 @@ export default class Transition extends Node {
 	constructor(component: Component, parent, scope, info) {
 		super(component, parent, scope, info);
 
-		component.warn_if_undefined(info, scope);
+		component.warn_if_undefined(info.name, info, scope);
 
 		this.name = info.name;
 		component.qualify(info.name);
diff --git a/src/compile/nodes/shared/Expression.ts b/src/compile/nodes/shared/Expression.ts
index 22cb403f75..fc188e9673 100644
--- a/src/compile/nodes/shared/Expression.ts
+++ b/src/compile/nodes/shared/Expression.ts
@@ -149,7 +149,7 @@ export default class Expression {
 						}
 
 						component.add_reference(name);
-						component.warn_if_undefined(nodes[0], template_scope);
+						component.warn_if_undefined(name, nodes[0], template_scope);
 					}
 
 					this.skip();