diff --git a/src/data_structures/hash_map.c b/src/data_structures/hash_map.c
index 2d97602..3804f74 100644
--- a/src/data_structures/hash_map.c
+++ b/src/data_structures/hash_map.c
@@ -74,7 +74,8 @@ unsigned long long simple_archiver_hash_map_internal_key_to_hash(
   unsigned long long temp = 0;
   unsigned int count = 0;
   for (unsigned int idx = 0; idx < key_size; ++idx) {
-    temp |= ((unsigned long long)*((unsigned char *)key)) << (8 * count);
+    temp |= ((unsigned long long)*((unsigned char *)key + count))
+            << (8 * count);
     ++count;
     if (count >= 8) {
       count = 0;