Index: uspace/app/mkminix/mkminix.c
===================================================================
--- uspace/app/mkminix/mkminix.c	(revision 197b6711f8e6df080d2b7c4515812dea65796c0c)
+++ uspace/app/mkminix/mkminix.c	(revision d3ce9515ba728d15742e68fb01b1940ba2f114e2)
@@ -331,10 +331,10 @@
 	itable_size = CONVERT_1K_OFF(sb->itable_size, sb->block_size);
 
-	itable_buf = malloc(sb->block_size);
+	itable_buf = malloc(MFS_MIN_BLOCKSIZE);
 
 	if (!itable_buf)
 		return ENOMEM;
 
-	memset(itable_buf, 0x00, sb->block_size);
+	memset(itable_buf, 0x00, MFS_MIN_BLOCKSIZE);
 
 	for (i = 0; i < itable_size; ++i, ++itable_off) {