diff --git a/portable/MemMang/heap_2.c b/portable/MemMang/heap_2.c
index 5c3cb55..c041443 100644
--- a/portable/MemMang/heap_2.c
+++ b/portable/MemMang/heap_2.c
@@ -229,9 +229,10 @@
                         pxNewBlockLink->xBlockSize = pxBlock->xBlockSize - xWantedSize;
                         pxBlock->xBlockSize = xWantedSize;
 
-                        /* Insert the new block into the list of free blocks. */
-                        pxNewBlockLink->pxNextFreeBlock = pxPreviousBlock->pxNextFreeBlock;
-                        pxPreviousBlock->pxNextFreeBlock = pxNewBlockLink;
+                        /* Insert the new block into the list of free blocks.
+                         * The list of free blocks is sorted by their size, we have to
+                         * iterate to find the right place to insert new block. */
+                        prvInsertBlockIntoFreeList( ( pxNewBlockLink ) );
                     }
 
                     xFreeBytesRemaining -= pxBlock->xBlockSize;