diff --git a/cpp/src/arrow/record_batch.cc b/cpp/src/arrow/record_batch.cc
index 5f1f192133beb..5e749f661f561 100644
--- a/cpp/src/arrow/record_batch.cc
+++ b/cpp/src/arrow/record_batch.cc
@@ -466,7 +466,7 @@ Result<std::shared_ptr<RecordBatch>> ConcatenateRecordBatches(
         length = array->length();
       } else if (length != array->length()) {
         return Status::Invalid(
-            "column index ", i, " length is ", array->length(),
+            "column index ", col, " length is ", array->length(),
             ", does not match the length of previous columns: ", length);
       }
       columns.push_back(array);