diff --git a/src/gsm/Makefile.am b/src/gsm/Makefile.am
index 7796caf..167aeb7 100644
--- a/src/gsm/Makefile.am
+++ b/src/gsm/Makefile.am
@@ -19,7 +19,7 @@
 			lapd_core.c lapdm.c \
 			auth_core.c auth_comp128v1.c auth_milenage.c \
 			milenage/aes-encblock.c milenage/aes-internal.c \
-			milenage/aes-internal-enc.c milenage/milenage.c
+			milenage/aes-internal-enc.c milenage/milenage.c gan.c
 
 libosmogsm_la_LDFLAGS = -Wl,--version-script=$(srcdir)/libosmogsm.map -version-info $(LIBVERSION)
 libosmogsm_la_LIBADD = $(top_builddir)/src/libosmocore.la