diff --git a/ChangeLog b/ChangeLog
index 757f1bbe5..38d3a8a98 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2009-07-01  Pavel Roskin  <proski@gnu.org>
 
+	* kern/mm.c: Use correct format to print size_t.
+
 	* include/grub/elf.h: Define Elf_Sword and Elf_Xword.
 	* kern/i386/dl.c: Use ELF symbols without "32" or "64".
 	* kern/powerpc/dl.c: Likewise.
diff --git a/kern/mm.c b/kern/mm.c
index a31dc2efd..9a0ae56ed 100644
--- a/kern/mm.c
+++ b/kern/mm.c
@@ -515,7 +515,7 @@ grub_debug_malloc (const char *file, int line, grub_size_t size)
   void *ptr;
 
   if (grub_mm_debug)
-    grub_printf ("%s:%d: malloc (0x%x) = ", file, line, size);
+    grub_printf ("%s:%d: malloc (0x%zx) = ", file, line, size);
   ptr = grub_malloc (size);
   if (grub_mm_debug)
     grub_printf ("%p\n", ptr);
@@ -534,7 +534,7 @@ void *
 grub_debug_realloc (const char *file, int line, void *ptr, grub_size_t size)
 {
   if (grub_mm_debug)
-    grub_printf ("%s:%d: realloc (%p, 0x%x) = ", file, line, ptr, size);
+    grub_printf ("%s:%d: realloc (%p, 0x%zx) = ", file, line, ptr, size);
   ptr = grub_realloc (ptr, size);
   if (grub_mm_debug)
     grub_printf ("%p\n", ptr);
@@ -548,7 +548,7 @@ grub_debug_memalign (const char *file, int line, grub_size_t align,
   void *ptr;
 
   if (grub_mm_debug)
-    grub_printf ("%s:%d: memalign (0x%x, 0x%x) = ",
+    grub_printf ("%s:%d: memalign (0x%zx, 0x%zx) = ",
 		 file, line, align, size);
   ptr = grub_memalign (align, size);
   if (grub_mm_debug)