diff --git a/22-malloc/libc/mem.c b/22-malloc/libc/mem.c
index 90f5f70b..5819238a 100644
--- a/22-malloc/libc/mem.c
+++ b/22-malloc/libc/mem.c
@@ -20,7 +20,7 @@ u32 free_mem_addr = 0x10000;
  * keeps growing */
 u32 kmalloc(u32 size, int align, u32 *phys_addr) {
     /* Pages are aligned to 4K, or 0x1000 */
-    if (align == 1 && (free_mem_addr & 0xFFFFF000)) {
+    if (align == 1 && (free_mem_addr & 0x00000FFF)) {
         free_mem_addr &= 0xFFFFF000;
         free_mem_addr += 0x1000;
     }