diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c
index af29cc4..849d7ce 100644
--- a/lib/efi_loader/efi_image_loader.c
+++ b/lib/efi_loader/efi_image_loader.c
@@ -133,8 +133,8 @@
 		image_size = opt->SizeOfImage;
 		efi_reloc = efi_alloc(virt_size, EFI_LOADER_DATA);
 		if (!efi_reloc) {
-			printf("%s: Could not allocate %ld bytes\n",
-				__func__, virt_size);
+			printf("%s: Could not allocate %lu bytes\n",
+			       __func__, virt_size);
 			return NULL;
 		}
 		entry = efi_reloc + opt->AddressOfEntryPoint;
@@ -147,8 +147,8 @@
 		image_size = opt->SizeOfImage;
 		efi_reloc = efi_alloc(virt_size, EFI_LOADER_DATA);
 		if (!efi_reloc) {
-			printf("%s: Could not allocate %ld bytes\n",
-				__func__, virt_size);
+			printf("%s: Could not allocate %lu bytes\n",
+			       __func__, virt_size);
 			return NULL;
 		}
 		entry = efi_reloc + opt->AddressOfEntryPoint;