diff --git a/src/create-storage-hook/index.ts b/src/create-storage-hook/index.ts
index e59a1ff2..3a14e5f2 100644
--- a/src/create-storage-hook/index.ts
+++ b/src/create-storage-hook/index.ts
@@ -34,7 +34,7 @@ export interface UseStorageParserOption<T> {
   deserializer: Deserializer<T>
 }
 
-function getServerSnapshotWithoutServerValue() {
+function getServerSnapshotWithoutServerValue(): never {
   throw noSSRError('useLocalStorage cannot be used on the server without a serverValue');
 }
 
diff --git a/src/use-url-hash-state/index.ts b/src/use-url-hash-state/index.ts
index cad07662..3869c606 100644
--- a/src/use-url-hash-state/index.ts
+++ b/src/use-url-hash-state/index.ts
@@ -53,7 +53,7 @@ export interface UseUrlHashStateParserOption<T> {
   deserializer: Deserializer<T>
 }
 
-function getServerSnapshotWithoutServerValue() {
+function getServerSnapshotWithoutServerValue(): never {
   throw noSSRError('useUrlHashState cannot be used on the server without a serverValue');
 }