diff --git a/kernel/trunk/core/heap.inc b/kernel/trunk/core/heap.inc
index dcccb1cc82..5c7fe45eb4 100644
--- a/kernel/trunk/core/heap.inc
+++ b/kernel/trunk/core/heap.inc
@@ -544,7 +544,8 @@ proc kernel_free stdcall, base:dword
 
            call mutex_unlock
 
-           mov ecx, [esi+block_size];
+           mov eax, [esi+block_base]
+           mov ecx, [esi+block_size]
            shr ecx, 12
            call release_pages   ;eax, ecx
            stdcall free_kernel_space, [base]