diff --git a/mm/mmap.c b/mm/mmap.c
index bda4188ef..1f7569626 100755
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -250,6 +250,13 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
 
 	newbrk = PAGE_ALIGN(brk);
 	oldbrk = PAGE_ALIGN(mm->brk);
+	/* properly handle unaligned min_brk as an empty heap */
+	if (min_brk & ~PAGE_MASK) {
+		if (brk == min_brk)
+			newbrk -= PAGE_SIZE;
+		if (mm->brk == min_brk)
+			oldbrk -= PAGE_SIZE;
+	}
 	if (oldbrk == newbrk) {
 		mm->brk = brk;
 		goto success;