diff --git a/include/cppkafka/utils/endianness.h b/include/cppkafka/detail/endianness.h
similarity index 100%
rename from include/cppkafka/utils/endianness.h
rename to include/cppkafka/detail/endianness.h
diff --git a/src/group_information.cpp b/src/group_information.cpp
index d300e25..9debeb6 100644
--- a/src/group_information.cpp
+++ b/src/group_information.cpp
@@ -3,7 +3,7 @@
 #include <algorithm>
 #include "topic_partition.h"
 #include "exceptions.h"
-#include "utils/endianness.h"
+#include "detail/endianness.h"
 
 using std::string;
 using std::vector;