diff --git a/.changeset/plenty-bikes-fold.md b/.changeset/plenty-bikes-fold.md
new file mode 100644
index 000000000..80a997036
--- /dev/null
+++ b/.changeset/plenty-bikes-fold.md
@@ -0,0 +1,5 @@
+---
+"@preact/signals": patch
+---
+
+Narrow types for Show utility, the callback is truthy by design
diff --git a/packages/preact/utils/src/index.ts b/packages/preact/utils/src/index.ts
index 98478882d..785d447b9 100644
--- a/packages/preact/utils/src/index.ts
+++ b/packages/preact/utils/src/index.ts
@@ -6,7 +6,7 @@ import { useMemo } from "preact/hooks";
 interface ShowProps<T = boolean> {
 	when: Signal<T> | ReadonlySignal<T>;
 	fallback?: JSX.Element;
-	children: JSX.Element | ((value: T) => JSX.Element);
+	children: JSX.Element | ((value: NonNullable<T>) => JSX.Element);
 }
 
 export function Show<T = boolean>(props: ShowProps<T>): JSX.Element | null {