diff --git a/include/osmocore/protocol/Makefile.am b/include/osmocore/protocol/Makefile.am
index 5df9fe7..03a4849 100644
--- a/include/osmocore/protocol/Makefile.am
+++ b/include/osmocore/protocol/Makefile.am
@@ -1,4 +1,6 @@
-osmocore_proto_HEADERS = gsm_04_08.h gsm_04_11.h gsm_04_80.h gsm_08_58.h \
-			 gsm_12_21.h gsm_08_08.h gsm_04_12.h
+osmocore_proto_HEADERS = gsm_03_41.h \
+			 gsm_04_08.h gsm_04_11.h gsm_04_12.h gsm_04_80.h \
+			 gsm_08_08.h gsm_08_58.h \
+			 gsm_12_21.h
 
 osmocore_protodir = $(includedir)/osmocore/protocol