diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
index d290c9a76..3705b8b1b 100644
--- a/grub-core/kern/efi/mm.c
+++ b/grub-core/kern/efi/mm.c
@@ -39,7 +39,7 @@
 #define MEMORY_MAP_SIZE	0x3000
 
 /* The default heap size for GRUB itself in bytes.  */
-#define DEFAULT_HEAP_SIZE	0x100000
+#define DEFAULT_HEAP_SIZE	0x2000000
 
 static void *finish_mmap_buf = 0;
 static grub_efi_uintn_t finish_mmap_size = 0;