diff --git a/packages/svelte/src/reactivity/map.js b/packages/svelte/src/reactivity/map.js
index 18a0b1de1b..7ed7d01df9 100644
--- a/packages/svelte/src/reactivity/map.js
+++ b/packages/svelte/src/reactivity/map.js
@@ -2,14 +2,14 @@ import { make_reactive, NOTIFY_WITH_ALL_PARAMS } from './utils.js';
 
 export const ReactiveMap = make_reactive(Map, {
 	write_properties: ['clear', 'delete', 'set'],
-	read_properties: ['get', 'keys', 'size', 'entries', 'values', 'has'],
+	read_properties: ['get', 'keys', 'entries', 'values', 'has'],
 	interceptors: {
 		set: (notify_read_methods, value, property, ...params) => {
 			if (value.get(params[0]) === params[1]) {
 				return false;
 			}
 			if (!value.has(params[0])) {
-				notify_read_methods(['keys', 'size']);
+				notify_read_methods(['keys']);
 			}
 			notify_read_methods(['entries', 'values']);
 			notify_read_methods(['get', 'has'], params[1]);
@@ -19,7 +19,7 @@ export const ReactiveMap = make_reactive(Map, {
 			if (value.size === 0) {
 				return false;
 			}
-			notify_read_methods(['keys', 'size', 'values', 'entries', 'has'], NOTIFY_WITH_ALL_PARAMS);
+			notify_read_methods(['keys', 'values', 'entries', 'has'], NOTIFY_WITH_ALL_PARAMS);
 			return true;
 		},
 		delete: (notify_read_methods, value, property, ...params) => {
@@ -27,7 +27,7 @@ export const ReactiveMap = make_reactive(Map, {
 				return false;
 			}
 			notify_read_methods(['get', 'has'], params[0]);
-			notify_read_methods(['keys', 'size', 'values', 'entries']);
+			notify_read_methods(['keys', 'values', 'entries']);
 			return true;
 		}
 	}
diff --git a/packages/svelte/src/reactivity/set.js b/packages/svelte/src/reactivity/set.js
index 532c85ec00..52fc70decb 100644
--- a/packages/svelte/src/reactivity/set.js
+++ b/packages/svelte/src/reactivity/set.js
@@ -2,14 +2,13 @@ import { make_reactive, NOTIFY_WITH_ALL_PARAMS } from './utils.js';
 
 export const ReactiveSet = make_reactive(Set, {
 	write_properties: ['add', 'clear', 'delete'],
-	read_properties: ['has', 'size'],
+	read_properties: ['has'],
 	interceptors: {
 		add: (notify_read_methods, value, property, ...params) => {
 			if (value.has(params[0])) {
 				return false;
 			}
 			notify_read_methods(['has'], params[0]);
-			notify_read_methods(['size']);
 			return true;
 		},
 		clear: (notify_read_methods, value, property, ...params) => {
@@ -17,7 +16,6 @@ export const ReactiveSet = make_reactive(Set, {
 				return false;
 			}
 			notify_read_methods(['has'], NOTIFY_WITH_ALL_PARAMS);
-			notify_read_methods(['size']);
 			return true;
 		},
 		delete: (notify_read_methods, value, property, ...params) => {
@@ -25,7 +23,6 @@ export const ReactiveSet = make_reactive(Set, {
 				return false;
 			}
 			notify_read_methods(['has'], params[0]);
-			notify_read_methods(['size']);
 			return true;
 		}
 	}