diff --git a/src/hnbap/Makefile.am b/src/hnbap/Makefile.am
index 15bee551..ca1df170 100644
--- a/src/hnbap/Makefile.am
+++ b/src/hnbap/Makefile.am
@@ -243,7 +243,14 @@ libosmo_asn1_hnbap_la_LIBADD=$(ASN1C_LDADD)
 regen: regenerate-from-asn1-source
 
 regenerate-from-asn1-source:
-	ASN1C_PREFIX="HNBAP_" asn1c -R -fcompound-names -gen-PER $(HNBAP_ASN1)/HNBAP-CommonDataTypes.asn $(HNBAP_ASN1)/HNBAP-Constants.asn $(HNBAP_ASN1)/HNBAP-IEs.asn $(HNBAP_ASN1)/HNBAP-PDU.asn
+	ASN1C_PREFIX="HNBAP_" asn1c \
+		-R \
+		-fcompound-names \
+		-gen-PER \
+		$(HNBAP_ASN1)/HNBAP-CommonDataTypes.asn \
+		$(HNBAP_ASN1)/HNBAP-Constants.asn \
+		$(HNBAP_ASN1)/HNBAP-IEs.asn \
+		$(HNBAP_ASN1)/HNBAP-PDU.asn
 #	change include style to `#include <dir/foo.h>'
 	$(top_srcdir)/move-asn1-header-files.sh osmocom/hnbap $(ASN_MODULE_INC)
 #	Finally copy *.c from buildir to srcdir:
diff --git a/src/ranap/Makefile.am b/src/ranap/Makefile.am
index 1193dcee..0ef95239 100644
--- a/src/ranap/Makefile.am
+++ b/src/ranap/Makefile.am
@@ -1169,7 +1169,14 @@ libosmo_asn1_ranap_la_LIBADD=$(ASN1C_LDADD)
 regen: regenerate-from-asn1-source
 
 regenerate-from-asn1-source:
-	ASN1C_PREFIX="RANAP_" asn1c -fcompound-names -R -gen-PER $(top_srcdir)/asn1/ranap/RANAP-CommonDataTypes.asn $(top_srcdir)/asn1/ranap/RANAP-Constants.asn $(top_srcdir)/asn1/ranap/RANAP-IEs.asn $(top_srcdir)/asn1/ranap/RANAP-PDU.asn
+	ASN1C_PREFIX="RANAP_" asn1c \
+		-fcompound-names \
+		-R \
+		-gen-PER \
+		$(top_srcdir)/asn1/ranap/RANAP-CommonDataTypes.asn \
+		$(top_srcdir)/asn1/ranap/RANAP-Constants.asn \
+		$(top_srcdir)/asn1/ranap/RANAP-IEs.asn \
+		$(top_srcdir)/asn1/ranap/RANAP-PDU.asn
 	sed -i '7i#include <constr_CHOICE.h>' RANAP_ChosenEncryptionAlgorithm.h RANAP_ChosenIntegrityProtectionAlgorithm.h RANAP_IMSI.h RANAP_PLMNidentity.h RANAP_RAB-ReleaseFailedList.c RANAP_RAB-ReleaseList.c RANAP_RAB-SetupOrModifyList.c RANAP_ResetResourceList.c RANAP_ResetResourceAckList.c
 #	change include style to `#include <dir/foo.h>'
 	$(top_srcdir)/move-asn1-header-files.sh osmocom/ranap $(ASN_MODULE_INC)
diff --git a/src/rua/Makefile.am b/src/rua/Makefile.am
index 8cb2e7dc..23ff20e7 100644
--- a/src/rua/Makefile.am
+++ b/src/rua/Makefile.am
@@ -81,7 +81,14 @@ libosmo_asn1_rua_la_LIBADD=$(ASN1C_LDADD)
 regen: regenerate-from-asn1-source
 
 regenerate-from-asn1-source:
-	ASN1C_PREFIX="RUA_" asn1c -R -fcompound-names -gen-PER $(top_srcdir)/asn1/rua/RUA-CommonDataTypes.asn $(top_srcdir)/asn1/rua/RUA-Constants.asn $(top_srcdir)/asn1/rua/RUA-IEs.asn $(top_srcdir)/asn1/rua/RUA-PDU.asn
+	ASN1C_PREFIX="RUA_" asn1c \
+		-R \
+		-fcompound-names \
+		-gen-PER \
+		$(top_srcdir)/asn1/rua/RUA-CommonDataTypes.asn \
+		$(top_srcdir)/asn1/rua/RUA-Constants.asn \
+		$(top_srcdir)/asn1/rua/RUA-IEs.asn \
+		$(top_srcdir)/asn1/rua/RUA-PDU.asn
 #	change include style to `#include <dir/foo.h>'
 	$(top_srcdir)/move-asn1-header-files.sh osmocom/rua $(ASN_MODULE_INC)
 #	Finally copy *.c from buildir to srcdir:
diff --git a/src/sabp/Makefile.am b/src/sabp/Makefile.am
index 0665db4a..8dc1390e 100644
--- a/src/sabp/Makefile.am
+++ b/src/sabp/Makefile.am
@@ -135,7 +135,14 @@ libosmo_asn1_sabp_la_LIBADD=$(ASN1C_LDADD)
 regen: regenerate-from-asn1-source
 
 regenerate-from-asn1-source:
-	ASN1C_PREFIX="SABP_" asn1c -R -fcompound-names -gen-PER $(top_srcdir)/asn1/sabp/SABP-CommonDataTypes.asn $(top_srcdir)/asn1/sabp/SABP-Constants.asn $(top_srcdir)/asn1/sabp/SABP-IEs.asn $(top_srcdir)/asn1/sabp/SABP-PDU.asn
+	ASN1C_PREFIX="SABP_" asn1c \
+		-R \
+		-fcompound-names \
+		-gen-PER \
+		$(top_srcdir)/asn1/sabp/SABP-CommonDataTypes.asn \
+		$(top_srcdir)/asn1/sabp/SABP-Constants.asn \
+		$(top_srcdir)/asn1/sabp/SABP-IEs.asn \
+		$(top_srcdir)/asn1/sabp/SABP-PDU.asn
 #	add missing includes
 	sed -i '/#include "SABP_Serial-Number.h"/a #include <constr_CHOICE.h>' SABP_Old-Serial-Number.h SABP_New-Serial-Number.h
 #	change include style to `#include <dir/foo.h>'