diff --git a/src/users.c b/src/users.c
index 52f4d25..2490e29 100644
--- a/src/users.c
+++ b/src/users.c
@@ -3,8 +3,11 @@
 #include <sha256.h>
 
 Noh_String hash_password(Noh_Arena *temp, Noh_String_View username, Noh_String_View password) {
+    noh_arena_save(temp);
+
     // Build the sha input string.
     Noh_String input = {0};
+    input.arena = temp;
     noh_string_append_sv(&input, username);
     noh_string_append_cstr(&input, "<><>");
     noh_string_append_sv(&input, password);
@@ -17,7 +20,6 @@ Noh_String hash_password(Noh_Arena *temp, Noh_String_View username, Noh_String_V
     sha256_final(&ctx, hash);
 
     // Build the result string.
-    noh_arena_save(temp);
     Noh_String result = {0};
     for (int i = 0; i < 32; i++) {
         noh_string_append_cstr(&result, noh_arena_sprintf(temp, "%02x", hash[i]));