diff --git a/cpp/src/arrow/chunked_array.cc b/cpp/src/arrow/chunked_array.cc
index 45534733c625f..12937406e7800 100644
--- a/cpp/src/arrow/chunked_array.cc
+++ b/cpp/src/arrow/chunked_array.cc
@@ -127,7 +127,7 @@ bool mayHaveNaN(const arrow::DataType& type) {
   return false;
 }
 
-} //  namespace
+}  //  namespace
 
 bool ChunkedArray::Equals(const std::shared_ptr<ChunkedArray>& other) const {
   if (!other) {