diff --git a/src/codec/Makefile.am b/src/codec/Makefile.am
index b4df5da..f77d910 100644
--- a/src/codec/Makefile.am
+++ b/src/codec/Makefile.am
@@ -13,6 +13,6 @@
 
 lib_LTLIBRARIES = libosmocodec.la
 
-libosmocodec_la_SOURCES = gsm610.c gsm620.c gsm660.c gsm690.c
+libosmocodec_la_SOURCES = gsm610.c gsm620.c gsm660.c gsm690.c ecu_fr.c
 libosmocodec_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined
 libosmocodec_la_LIBADD = $(top_builddir)/src/libosmocore.la