@@ -, +, @@ 
---
 src/bluealsa-iface.h | 6 +++---
 src/bluez-a2dp.h     | 4 ++--
 src/bluez-iface.h    | 6 +++---
 src/ofono-iface.h    | 4 ++--
 test/server-mock.c   | 1 +
 test/test-ba.c       | 1 +
 test/test-io.c       | 1 +
 test/test-rfcomm.c   | 1 +
 8 files changed, 14 insertions(+), 10 deletions(-)
--- a/src/bluealsa-iface.h	
+++ a/src/bluealsa-iface.h	
@@ -32,8 +32,8 @@ 
 #define BLUEALSA_RFCOMM_MODE_HSP_AG "HSP-AG"
 #define BLUEALSA_RFCOMM_MODE_HSP_HS "HSP-HS"
 
-const GDBusInterfaceInfo bluealsa_iface_manager;
-const GDBusInterfaceInfo bluealsa_iface_pcm;
-const GDBusInterfaceInfo bluealsa_iface_rfcomm;
+extern const GDBusInterfaceInfo bluealsa_iface_manager;
+extern const GDBusInterfaceInfo bluealsa_iface_pcm;
+extern const GDBusInterfaceInfo bluealsa_iface_rfcomm;
 
 #endif
--- a/src/bluez-a2dp.h	
+++ a/src/bluez-a2dp.h	
@@ -1,6 +1,6 @@ 
 /*
  * BlueALSA - bluez-a2dp.h
- * Copyright (c) 2016-2019 Arkadiusz Bokowy
+ * Copyright (c) 2016-2020 Arkadiusz Bokowy
  *
  * This file is a part of bluez-alsa.
  *
@@ -58,6 +58,6 @@ struct bluez_a2dp_codec {
 };
 
 /* NULL-terminated list of available A2DP codecs */
-const struct bluez_a2dp_codec **bluez_a2dp_codecs;
+extern const struct bluez_a2dp_codec **bluez_a2dp_codecs;
 
 #endif
--- a/src/bluez-iface.h	
+++ a/src/bluez-iface.h	
@@ -1,6 +1,6 @@ 
 /*
  * BlueALSA - bluez-iface.h
- * Copyright (c) 2016-2019 Arkadiusz Bokowy
+ * Copyright (c) 2016-2020 Arkadiusz Bokowy
  *
  * This file is a part of bluez-alsa.
  *
@@ -27,7 +27,7 @@ 
 #define BLUEZ_TRANSPORT_STATE_PENDING "pending"
 #define BLUEZ_TRANSPORT_STATE_ACTIVE  "active"
 
-const GDBusInterfaceInfo bluez_iface_endpoint;
-const GDBusInterfaceInfo bluez_iface_profile;
+extern const GDBusInterfaceInfo bluez_iface_endpoint;
+extern const GDBusInterfaceInfo bluez_iface_profile;
 
 #endif
--- a/src/ofono-iface.h	
+++ a/src/ofono-iface.h	
@@ -1,6 +1,6 @@ 
 /*
  * BlueALSA - ofono-iface.h
- * Copyright (c) 2016-2019 Arkadiusz Bokowy
+ * Copyright (c) 2016-2020 Arkadiusz Bokowy
  *               2018 Thierry Bultel
  *
  * This file is a part of bluez-alsa.
@@ -27,6 +27,6 @@ 
 #define OFONO_AUDIO_CODEC_CVSD 0x01
 #define OFONO_AUDIO_CODEC_MSBC 0x02
 
-const GDBusInterfaceInfo ofono_iface_hf_audio_agent;
+extern const GDBusInterfaceInfo ofono_iface_hf_audio_agent;
 
 #endif
--- a/test/server-mock.c	
+++ a/test/server-mock.c	
@@ -36,6 +36,7 @@ 
 #include "../src/ba-adapter.c"
 #include "../src/ba-device.c"
 #include "../src/ba-transport.c"
+#include "../src/bluez-a2dp.c"
 #include "../src/hci.c"
 #include "../src/msbc.c"
 #include "../src/rfcomm.c"
--- a/test/test-ba.c	
+++ a/test/test-ba.c	
@@ -22,6 +22,7 @@ 
 #include "../src/utils.c"
 #include "../src/shared/log.c"
 
+const struct bluez_a2dp_codec **bluez_a2dp_codecs = NULL;
 int a2dp_thread_create(struct ba_transport *t) { (void)t; return 0; }
 void *rfcomm_thread(struct ba_transport *t) { (void)t; return 0; }
 void *sco_thread(struct ba_transport *t) { (void)t; return 0; }
--- a/test/test-io.c	
+++ a/test/test-io.c	
@@ -33,6 +33,7 @@ 
 #include "../src/shared/log.c"
 #include "../src/shared/rt.c"
 
+const struct bluez_a2dp_codec **bluez_a2dp_codecs = NULL;
 unsigned int bluealsa_dbus_pcm_register(struct ba_transport *t, GError **error) {
 	debug("%s: %p", __func__, (void *)t); (void)error; return 0; }
 void bluealsa_dbus_pcm_update(struct ba_transport *t, unsigned int mask) {
--- a/test/test-rfcomm.c	
+++ a/test/test-rfcomm.c	
@@ -34,6 +34,7 @@ static pthread_mutex_t transport_codec_updated_mtx = PTHREAD_MUTEX_INITIALIZER;
 static pthread_cond_t transport_codec_updated = PTHREAD_COND_INITIALIZER;
 static unsigned int transport_codec_updated_cnt = 0;
 
+const struct bluez_a2dp_codec **bluez_a2dp_codecs = NULL;
 unsigned int bluealsa_dbus_pcm_register(struct ba_transport *t, GError **error) {
 	debug("%s: %p", __func__, (void *)t); (void)error; return 0; }
 void bluealsa_dbus_pcm_update(struct ba_transport *t, unsigned int mask) {
--