diff --git a/lib/roken/Makefile.am b/lib/roken/Makefile.am
index ee52c2412..82cbba0ea 100644
--- a/lib/roken/Makefile.am
+++ b/lib/roken/Makefile.am
@@ -7,7 +7,8 @@ INCLUDES = -I$(top_builddir)/include
 lib_LIBRARIES = libroken.a
 
 libroken_a_SOURCES = \
-	base64.c get_window_size.c getarg.c inaddr2str.o k_getpwnam.c	\
+	base64.c concat.c get_window_size.c getarg.c inaddr2str.o \
+	k_getpwnam.c	\
 	k_getpwuid.c mini_inetd.c parse_time.c parse_units.c signal.c	\
 	snprintf.c strcasecmp.c verify.c warnerr.c