diff --git a/src/data/hills.cpp b/src/data/hills.cpp
index f42b450..fc8c969 100644
--- a/src/data/hills.cpp
+++ b/src/data/hills.cpp
@@ -9,14 +9,14 @@
 #include "kulle_7_png.hpp"
 
 
-unsigned const char *hills[] = {
-        kulle_0_png,
-        kulle_1_png,
-        kulle_2_png,
-        kulle_3_png,
-        kulle_4_png,
-        kulle_5_png,
-        kulle_6_png,
-        kulle_7_png,
+const HillData hills[] = {
+        {kulle_0_png, kulle_0_png_length},
+        {kulle_1_png, kulle_1_png_length},
+        {kulle_2_png, kulle_2_png_length},
+        {kulle_3_png, kulle_3_png_length},
+        {kulle_4_png, kulle_4_png_length},
+        {kulle_5_png, kulle_5_png_length},
+        {kulle_6_png, kulle_6_png_length},
+        {kulle_7_png, kulle_7_png_length},
 };
 extern const size_t hills_length = 8;
diff --git a/src/data/hills.hpp b/src/data/hills.hpp
index 53ec66f..e744e7e 100644
--- a/src/data/hills.hpp
+++ b/src/data/hills.hpp
@@ -1,4 +1,9 @@
 #pragma once
 
-extern unsigned const char *hills[];
+
+struct HillData {
+    unsigned const char *data;
+    const size_t length;
+};
+extern const HillData hills[];
 extern const size_t hills_length;