diff --git a/packages/react-reconciler/src/ReactFiberHooks.new.js b/packages/react-reconciler/src/ReactFiberHooks.new.js
index e2d5244746347..7b7d0f648ae2b 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.new.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.new.js
@@ -1012,7 +1012,8 @@ function useMutableSource<Source, Snapshot>(
       const latestSetSnapshot = refs.setSnapshot;
 
       try {
-        latestSetSnapshot(latestGetSnapshot(source._source));
+        const value = latestGetSnapshot(source._source);
+        latestSetSnapshot(() => value);
 
         // Record a pending mutable source update with the same expiration time.
         const suspenseConfig = requestCurrentSuspenseConfig();
diff --git a/packages/react-reconciler/src/ReactFiberHooks.old.js b/packages/react-reconciler/src/ReactFiberHooks.old.js
index fc925dbe7bda2..bd44f670e60b8 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.old.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.old.js
@@ -1004,7 +1004,8 @@ function useMutableSource<Source, Snapshot>(
       const latestSetSnapshot = refs.setSnapshot;
 
       try {
-        latestSetSnapshot(latestGetSnapshot(source._source));
+        const value = latestGetSnapshot(source._source);
+        latestSetSnapshot(() => value);
 
         // Record a pending mutable source update with the same expiration time.
         const currentTime = requestCurrentTimeForUpdate();
diff --git a/packages/react-reconciler/src/__tests__/useMutableSource-test.internal.js b/packages/react-reconciler/src/__tests__/useMutableSource-test.internal.js
index 7bdb1b44207a5..fa767df99a04c 100644
--- a/packages/react-reconciler/src/__tests__/useMutableSource-test.internal.js
+++ b/packages/react-reconciler/src/__tests__/useMutableSource-test.internal.js
@@ -1493,6 +1493,45 @@ describe('useMutableSource', () => {
     },
   );
 
+  // @gate experimental
+  it(
+    'can store functions in source',
+    async () => {
+      const source = createSource(() => 'a');
+      const mutableSource = createMutableSource(source);
+
+      const getSnapshot = () => source.value;
+
+      function Read() {
+        const fn = useMutableSource(
+          mutableSource,
+          getSnapshot,
+          defaultSubscribe,
+        );
+        const value = fn();
+        Scheduler.unstable_yieldValue(value);
+        return value;
+      }
+
+      const root = ReactNoop.createRoot();
+      await act(async () => {
+        root.render(
+          <>
+            <Read />
+          </>,
+        );
+      });
+      expect(Scheduler).toHaveYielded(['a']);
+      expect(root).toMatchRenderedOutput('a');
+
+      await act(async () => {
+        source.value = () => 'b';
+        expect(Scheduler).toFlushUntilNextPaint(['b']);
+        expect(root).toMatchRenderedOutput('b');
+      });
+    },
+  );
+
   // @gate experimental
   it('getSnapshot changes and then source is mutated during interleaved event', async () => {
     const {useEffect} = React;