diff --git a/kernel/hashlib.h b/kernel/hashlib.h
index b3f99bf730f..be759fdf0a4 100644
--- a/kernel/hashlib.h
+++ b/kernel/hashlib.h
@@ -988,7 +988,7 @@ class pool
 		return !operator==(other);
 	}
 
-	bool hash() const {
+	unsigned int hash() const {
 		unsigned int hashval = mkhash_init;
 		for (auto &it : entries)
 			hashval ^= ops.hash(it.udata);