diff --git a/include/cppkafka/detail/endianness.h b/include/cppkafka/detail/endianness.h
index 21594c1..0b7d41d 100644
--- a/include/cppkafka/detail/endianness.h
+++ b/include/cppkafka/detail/endianness.h
@@ -14,7 +14,7 @@
 
 #endif
 
-#if defined(__linux__) || defined(__CYGWIN__)
+#if defined(__linux__) || defined(__CYGWIN__) || defined(__sun)
 
 #   include <endian.h>