diff --git a/include/arch/amd64/mm/phys.h b/include/arch/amd64/mm/phys.h
index 88a69b0..5bd542d 100644
--- a/include/arch/amd64/mm/phys.h
+++ b/include/arch/amd64/mm/phys.h
@@ -1,8 +1,7 @@
 #pragma once
 #include "arch/amd64/loader/multiboot.h"
-//#include <sys/types.h>
+#include "sys/types.h"
 #include <stdint.h>
-typedef uintptr_t size_t;
 
 void amd64_phys_memory_map(const multiboot_memory_map_t *mmap, size_t length);
 
diff --git a/include/sys/heap.h b/include/sys/heap.h
index f9759bf..e09f3f9 100644
--- a/include/sys/heap.h
+++ b/include/sys/heap.h
@@ -3,9 +3,7 @@
  * @brief Kernel heap memory managament functions
  */
 #pragma once
-//#include <sys/types.h>
-#include <stdint.h>
-typedef uintptr_t size_t;
+#include "sys/types.h"
 
 /**
  * @brief Common kernel heap alloc
diff --git a/include/sys/types.h b/include/sys/types.h
new file mode 100644
index 0000000..75b16a7
--- /dev/null
+++ b/include/sys/types.h
@@ -0,0 +1,5 @@
+#pragma once
+#include <stdint.h>
+
+typedef uintptr_t size_t;
+typedef intptr_t ssize_t;