diff --git a/ubb-vga/physmem.c b/ubb-vga/physmem.c
index b0921bc..348dda0 100644
--- a/ubb-vga/physmem.c
+++ b/ubb-vga/physmem.c
@@ -21,13 +21,25 @@
  */
 
 
+static void align_brk(int alignment)
+{
+	unsigned long addr;
+
+	addr = (unsigned long) sbrk(0);
+	sbrk(alignment-(addr % alignment));
+}
+
+
 void **calloc_phys_vec(size_t n, size_t size)
 {
 	void **vec;
 	int i;
 
+	align_brk(sizeof(void *));
 	vec = sbrk(sizeof(void *)*n);
+
 	for (i = 0; i != n; i++) {
+		align_brk(512);	/* crude page alignment */
 		vec[i] = sbrk(size);
 		memset(vec[i], 0, size);
 	}