diff --git a/Alc/ALu.c b/Alc/ALu.c
index 78604c1a..71804a3f 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -36,6 +36,7 @@
 #include "hrtf.h"
 #include "static_assert.h"
 
+#include "backends/base.h"
 #include "midi/base.h"
 
 
@@ -1134,7 +1135,7 @@ ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size)
         for(c = 0;c < MaxChannels;c++)
             memset(device->DryBuffer[c], 0, SamplesToDo*sizeof(ALfloat));
 
-        ALCdevice_Lock(device);
+        V0(device->Backend,lock)();
         V(device->Synth,process)(SamplesToDo, device->DryBuffer);
 
         ctx = ATOMIC_LOAD(&device->ContextList);
@@ -1213,7 +1214,7 @@ ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size)
         device->SamplesDone += SamplesToDo;
         device->ClockBase += (device->SamplesDone/device->Frequency) * DEVICE_CLOCK_RES;
         device->SamplesDone %= device->Frequency;
-        ALCdevice_Unlock(device);
+        V0(device->Backend,unlock)();
 
         if(device->Bs2b)
         {
diff --git a/OpenAL32/alState.c b/OpenAL32/alState.c
index 180a8c04..f2f25f97 100644
--- a/OpenAL32/alState.c
+++ b/OpenAL32/alState.c
@@ -30,6 +30,7 @@
 #include "alAuxEffectSlot.h"
 #include "alMidi.h"
 
+#include "backends/base.h"
 #include "midi/base.h"
 
 
@@ -346,9 +347,9 @@ AL_API ALint64SOFT AL_APIENTRY alGetInteger64SOFT(ALenum pname)
 
     case AL_MIDI_CLOCK_SOFT:
         device = context->Device;
-        ALCdevice_Lock(device);
+        V0(device->Backend,lock)();
         value = MidiSynth_getTime(device->Synth);
-        ALCdevice_Unlock(device);
+        V0(device->Backend,unlock)();
         break;
 
     case AL_SOUNDFONTS_SIZE_SOFT: