--- a/include/libnet.h
+++ b/include/libnet.h
@@ -84,8 +84,8 @@
 #define LIBNET_VERSION  "1.0.2a"
 
 #if (!LIBNET_LIL_ENDIAN && !LIBNET_BIG_ENDIAN)
-#error "byte order has not been specified, you'll
-need to #define either LIBNET_LIL_ENDIAN or LIBNET_BIG_ENDIAN.  See the
+#error "byte order has not been specified, you'll \
+need to #define either LIBNET_LIL_ENDIAN or LIBNET_BIG_ENDIAN.  See the \
 documentation regarding the libnet-config script."
 #endif