diff --git a/appl/ftp/common/Makefile.am b/appl/ftp/common/Makefile.am
index adb71a38f..1bcb331c9 100644
--- a/appl/ftp/common/Makefile.am
+++ b/appl/ftp/common/Makefile.am
@@ -9,4 +9,5 @@ noinst_LIBRARIES = libcommon.a
 libcommon_a_SOURCES = \
 	sockbuf.c \
 	buffer.c \
+	socket.c \
 	common.h