diff --git a/miniaudio.h b/miniaudio.h
index 5dc303b3..3c850d3b 100644
--- a/miniaudio.h
+++ b/miniaudio.h
@@ -21121,6 +21121,7 @@ static ma_result ma_device_start__null(ma_device* pDevice)
     ma_device_state_null* pDeviceStateNull = ma_device_get_backend_state__null(pDevice);
 
     MA_ASSERT(pDeviceStateNull != NULL);
+    (void)pDeviceStateNull;
 
     return MA_SUCCESS;
 }
@@ -21130,6 +21131,7 @@ static ma_result ma_device_stop__null(ma_device* pDevice)
     ma_device_state_null* pDeviceStateNull = ma_device_get_backend_state__null(pDevice);
 
     MA_ASSERT(pDeviceStateNull != NULL);
+    (void)pDeviceStateNull;
 
     return MA_SUCCESS;
 }
@@ -42913,6 +42915,8 @@ static ma_result ma_device_init_fd__oss(ma_device* pDevice, const ma_device_conf
     MA_ASSERT(pFD != NULL);
     MA_ASSERT(deviceType != ma_device_type_duplex);
 
+    (void)pDeviceConfigOSS;
+
     pDeviceID     = pDescriptor->pDeviceID;
     shareMode     = pDescriptor->shareMode;
     ossFormat     = ma_format_to_oss((pDescriptor->format != ma_format_unknown) ? pDescriptor->format : ma_format_s16); /* Use s16 by default because OSS doesn't like floating point. */
@@ -47333,7 +47337,7 @@ static ma_result ma_device_op_do_init(ma_device* pDevice, ma_device_op_params pa
     } else {
         /* Should never hit this. */
         MA_ASSERT(!"No onDeviceInit callback.");
-        result = MA_NOT_IMPLEMENTED;
+        return MA_NOT_IMPLEMENTED;
     }
 
     /* Store the backend state as soon as possible. */