diff --git a/src/osmo-bts-litecell15/lc15_l1_if.c b/src/osmo-bts-litecell15/lc15_l1_if.c
index 13e0fc9..c1b9b71 100644
--- a/src/osmo-bts-litecell15/lc15_l1_if.c
+++ b/src/osmo-bts-litecell15/lc15_l1_if.c
@@ -361,7 +361,7 @@
 	return 0;
 }
 
-void *l1if_open_pdch(uint8_t trx_no, uint32_t hlayer1)
+void *l1if_open_pdch(uint8_t trx_no, uint32_t hlayer1, struct gsmtap_inst *gsmtap)
 {
 	struct lc15l1_hdl *fl1h;
 	int rc;
diff --git a/src/osmo-bts-oc2g/oc2g_l1_if.c b/src/osmo-bts-oc2g/oc2g_l1_if.c
index a41e7af..dae5908 100644
--- a/src/osmo-bts-oc2g/oc2g_l1_if.c
+++ b/src/osmo-bts-oc2g/oc2g_l1_if.c
@@ -366,7 +366,7 @@
 	return 0;
 }
 
-void *l1if_open_pdch(uint8_t trx_no, uint32_t hlayer1)
+void *l1if_open_pdch(uint8_t trx_no, uint32_t hlayer1, struct gsmtap_inst *gsmtap)
 {
 	struct oc2gl1_hdl *fl1h;
 	int rc;