diff --git a/Source/Additions/Unicode.m b/Source/Additions/Unicode.m
index d7ab6d89e..9478e2840 100644
--- a/Source/Additions/Unicode.m
+++ b/Source/Additions/Unicode.m
@@ -723,7 +723,7 @@ if (dst == 0) \
      * reset the offset into the local buffer on the \
      * stack and pretend the buffer has grown. \
      */ \
-    ptr = buf; \
+    ptr = buf - bsize; \
     if (extra == 0) \
       { \
 	bsize += BUFSIZ; \
@@ -1247,7 +1247,7 @@ if (dst == 0) \
      * reset the offset into the local buffer on the \
      * stack and pretend the buffer has grown. \
      */ \
-    ptr = buf; \
+    ptr = buf - bsize; \
     if (extra == 0) \
       { \
 	bsize += BUFSIZ; \