diff --git a/src/osmo-bts-octphy/l1_utils.h b/src/osmo-bts-octphy/l1_utils.h
index d1a871701..1c1d22258 100644
--- a/src/osmo-bts-octphy/l1_utils.h
+++ b/src/osmo-bts-octphy/l1_utils.h
@@ -2,8 +2,8 @@
 
 #include <osmocom/core/utils.h>
 
-const struct value_string octphy_l1sapi_names[23];
-const struct value_string octphy_dir_names[5];
-const struct value_string octphy_clkmgr_state_vals[8];
-const struct value_string octphy_cid_vals[37];
-const struct value_string octphy_eid_vals[7];
+extern const struct value_string octphy_l1sapi_names[23];
+extern const struct value_string octphy_dir_names[5];
+extern const struct value_string octphy_clkmgr_state_vals[8];
+extern const struct value_string octphy_cid_vals[37];
+extern const struct value_string octphy_eid_vals[7];