1 files changed, 4 insertions, 0 deletions
diff --git a/Alc/ALc.c b/Alc/ALc.c
index 1028321e..17b2727d 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -4182,7 +4182,11 @@ FORCE_ALIGN ALC_API void ALC_APIENTRY alcRenderSamplesSOFT(ALCdevice *device, AL
     else if(samples < 0 || (samples > 0 && buffer == NULL))
         alcSetError(device, ALC_INVALID_VALUE);
     else
+    {
+        V0(device->Backend,lock)();
         aluMixData(device, buffer, samples);
+        V0(device->Backend,unlock)();
+    }
     if(device) ALCdevice_DecRef(device);
 }