diff --git a/groups/ntc/ntcd/ntcd_datautil.cpp b/groups/ntc/ntcd/ntcd_datautil.cpp
index cd557f8c..da772272 100644
--- a/groups/ntc/ntcd/ntcd_datautil.cpp
+++ b/groups/ntc/ntcd/ntcd_datautil.cpp
@@ -52,7 +52,7 @@ void DataUtil::generateData(bsl::string* result,
     result->clear();
     result->resize(size);
 
-    for (bsl::size_t i = offset; i < offset + size; ++i) {
+    for (bsl::size_t i = 0; i < size; ++i) {
         (*result)[i] = generateByte(offset + i, dataset);
     }
 }