diff --git a/docs/book/project/ch04_reactivity/src/main.rs b/docs/book/project/ch04_reactivity/src/main.rs
index 6af2cfad5..57440bf2a 100644
--- a/docs/book/project/ch04_reactivity/src/main.rs
+++ b/docs/book/project/ch04_reactivity/src/main.rs
@@ -1,7 +1,7 @@
 use leptos::*;
 
 fn main() {
-    run_scope(|cx| {
+    run_scope(create_runtime(), |cx| {
         // signal
         let (count, set_count) = create_signal(cx, 1);
 
diff --git a/docs/book/src/04_reactivity.md b/docs/book/src/04_reactivity.md
index f26558437..c65e098b1 100644
--- a/docs/book/src/04_reactivity.md
+++ b/docs/book/src/04_reactivity.md
@@ -27,7 +27,7 @@ But that’s _exactly_ how reactive programming works.
 ```rust
 use leptos::*;
 
-run_scope(|cx| {
+run_scope(create_runtime(), |cx| {
     let (a, set_a) = create_signal(cx, 0);
     let (b, set_b) = create_signal(cx, 0);
     let c = move || a() + b();
@@ -46,7 +46,7 @@ Hopefully, this makes some intuitive sense. After all, `c` is a closure. Calling
 ```rust
 use leptos::*;
 
-run_scope(|cx| {
+run_scope(create_runtime(), |cx| {
     let (a, set_a) = create_signal(cx, 0);
     let (b, set_b) = create_signal(cx, 0);
     let c = move || a() + b();