diff --git a/src/pcu_l1_if_phy.h b/src/pcu_l1_if_phy.h
index 318d0aa..297883b 100644
--- a/src/pcu_l1_if_phy.h
+++ b/src/pcu_l1_if_phy.h
@@ -3,6 +3,7 @@
 #include <stdint.h>
 #include <osmocom/core/gsmtap_util.h>
 
+int l1if_init(void);
 void *l1if_open_pdch(uint8_t trx_no, uint32_t hlayer1, struct gsmtap_inst *gsmtap);
 int l1if_connect_pdch(void *obj, uint8_t ts);
 int l1if_pdch_req(void *obj, uint8_t ts, int is_ptcch, uint32_t fn, uint16_t arfcn, uint8_t block_nr, uint8_t *data,