Index: src/deltacmd.c
==================================================================
--- src/deltacmd.c
+++ src/deltacmd.c
@@ -29,16 +29,16 @@
   const char *zOrig, *zTarg;
   int lenOrig, lenTarg;
   int len;
   char *zRes;
   blob_zero(pDelta);
-  zOrig = blob_buffer(pOriginal);
+  zOrig = blob_materialize(pOriginal);
   lenOrig = blob_size(pOriginal);
-  zTarg = blob_buffer(pTarget);
+  zTarg = blob_materialize(pTarget);
   lenTarg = blob_size(pTarget);
   blob_resize(pDelta, lenTarg+16);
-  zRes = blob_buffer(pDelta);
+  zRes = blob_materialize(pDelta);
   len = delta_create(zOrig, lenOrig, zTarg, lenTarg, zRes);
   blob_resize(pDelta, len);
   return 0;
 }