diff --git a/.changeset/mean-flies-grow.md b/.changeset/mean-flies-grow.md
new file mode 100644
index 000000000..cef2089fd
--- /dev/null
+++ b/.changeset/mean-flies-grow.md
@@ -0,0 +1,5 @@
+---
+"@preact/signals": patch
+---
+
+Made useSignalEffect more permissive in the functions it accepts.
diff --git a/packages/preact/src/index.ts b/packages/preact/src/index.ts
index caf2c525a..1f2efa00c 100644
--- a/packages/preact/src/index.ts
+++ b/packages/preact/src/index.ts
@@ -40,7 +40,7 @@ function hook<T extends OptionsTypes>(hookName: T, hookFn: HookFn<T>) {
 }
 
 let currentComponent: AugmentedComponent | undefined;
-let finishUpdate: (() => void) | undefined;
+let finishUpdate: (() => unknown) | undefined;
 
 function setCurrentUpdater(updater?: Effect) {
 	// end tracking for the current update:
@@ -49,7 +49,7 @@ function setCurrentUpdater(updater?: Effect) {
 	finishUpdate = updater && updater._start();
 }
 
-function createUpdater(update: () => void) {
+function createUpdater(update: () => unknown) {
 	let updater!: Effect;
 	effect(function (this: Effect) {
 		updater = this;
@@ -356,12 +356,12 @@ export function useComputed<T>(compute: () => T) {
 	return useMemo(() => computed<T>(() => $compute.current()), []);
 }
 
-export function useSignalEffect(cb: () => void | (() => void)) {
+export function useSignalEffect(cb: () => unknown | (() => unknown)) {
 	const callback = useRef(cb);
 	callback.current = cb;
 
 	useEffect(() => {
-		return effect(() => callback.current());
+		return effect(() => { callback.current() });
 	}, []);
 }