diff --git a/src/audio/backend/openal2.h b/src/audio/backend/openal2.h
index 66a45af5a..b6c82e7c4 100644
--- a/src/audio/backend/openal2.h
+++ b/src/audio/backend/openal2.h
@@ -137,6 +137,14 @@ private:
     Filter_Audio* filterer = nullptr;
     LPALCLOOPBACKOPENDEVICESOFT alcLoopbackOpenDeviceSOFT = nullptr;
     LPALCISRENDERFORMATSUPPORTEDSOFT alcIsRenderFormatSupportedSOFT = nullptr;
+
+    // needed because Ubuntu 14.04 lacks the AL_SOFT_source_latency extension
+#ifndef AL_SOFT_source_latency
+    #define AL_SAMPLE_OFFSET_LATENCY_SOFT            0x1200
+    #define AL_SEC_OFFSET_LATENCY_SOFT               0x1201
+    typedef void (AL_APIENTRY*LPALGETSOURCEDVSOFT)(ALuint,ALenum,const ALdouble*);
+#endif
+
     LPALGETSOURCEDVSOFT alGetSourcedvSOFT = nullptr;
     LPALCRENDERSAMPLESSOFT alcRenderSamplesSOFT = nullptr;
 };