diff --git a/include/llvm/ADT/SmallString.h b/include/llvm/ADT/SmallString.h
index afcaafb293c..9be654ee7e1 100644
--- a/include/llvm/ADT/SmallString.h
+++ b/include/llvm/ADT/SmallString.h
@@ -56,7 +56,7 @@ public:
 
   SmallString &append_uint_32(uint32_t N) {
     char Buffer[20];
-    char *BufPtr = Buffer+19;
+    char *BufPtr = Buffer+20;
     
     if (N == 0) *--BufPtr = '0';  // Handle special case.
     
@@ -73,7 +73,7 @@ public:
       return append_uint_32(uint32_t(N));
     
     char Buffer[40];
-    char *BufPtr = Buffer+39;
+    char *BufPtr = Buffer+40;
     
     if (N == 0) *--BufPtr = '0';  // Handle special case...