diff --git a/arch/alpha/boot/tools/mkbb.c b/arch/alpha/boot/tools/mkbb.c
index 632a7fd6d7dc..1185778e6a1e 100644
--- a/arch/alpha/boot/tools/mkbb.c
+++ b/arch/alpha/boot/tools/mkbb.c
@@ -11,6 +11,7 @@
 
 #include <fcntl.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <stdio.h>
 
 /* Minimal definition of disklabel, so we don't have to include
@@ -114,7 +115,7 @@ int main(int argc, char ** argv)
     nread = read(fd, &bootloader_image, sizeof(bootblock));
     if(nread != sizeof(bootblock)) {
 	perror("lxboot read");
-	fprintf(stderr, "expected %d, got %d\n", sizeof(bootblock), nread);
+	fprintf(stderr, "expected %zd, got %d\n", sizeof(bootblock), nread);
 	exit(0);
     }
 
@@ -122,7 +123,7 @@ int main(int argc, char ** argv)
     nread = read(dev, &bootblock_from_disk, sizeof(bootblock));
     if(nread != sizeof(bootblock)) {
 	perror("bootblock read");
-	fprintf(stderr, "expected %d, got %d\n", sizeof(bootblock), nread);
+	fprintf(stderr, "expected %zd, got %d\n", sizeof(bootblock), nread);
 	exit(0);
     }