encoder.go | 16 +++-------------
 opus.go    | 15 ++++-----------

diff --git a/encoder.go b/encoder.go
index cd67484a0fe820bc4ec90d168ffd415f78dde97a..0ffaa66bb29d2ba6ac3d1400d6dfb757a290bbd7 100644
--- a/encoder.go
+++ b/encoder.go
@@ -68,22 +68,12 @@ {
 	return opus_encoder_ctl(st, OPUS_GET_MAX_BANDWIDTH(max_bw));
 }
 
-// Access the preprocessor from CGO
-const int CONST_BANDWIDTH_NARROWBAND = OPUS_BANDWIDTH_NARROWBAND;
-const int CONST_BANDWIDTH_MEDIUMBAND = OPUS_BANDWIDTH_MEDIUMBAND;
-const int CONST_BANDWIDTH_WIDEBAND = OPUS_BANDWIDTH_WIDEBAND;
-const int CONST_BANDWIDTH_SUPERWIDEBAND = OPUS_BANDWIDTH_SUPERWIDEBAND;
-const int CONST_BANDWIDTH_FULLBAND = OPUS_BANDWIDTH_FULLBAND;
-
-const int CONST_BITRATE_AUTO = OPUS_AUTO;
-const int CONST_BITRATE_MAX = OPUS_BITRATE_MAX;
-
 */
 import "C"
 
 type Bandwidth int
 
-var (
+const (
 	// 4 kHz passband
 	Narrowband = Bandwidth(C.OPUS_BANDWIDTH_NARROWBAND)
 	// 6 kHz passband
@@ -246,7 +236,7 @@ }
 
 // SetBitrateToAuto will allow the encoder to automatically set the bitrate
 func (enc *Encoder) SetBitrateToAuto() error {
-	res := C.bridge_encoder_set_bitrate(enc.p, C.opus_int32(C.CONST_BITRATE_AUTO))
+	res := C.bridge_encoder_set_bitrate(enc.p, C.opus_int32(C.OPUS_AUTO))
 	if res != C.OPUS_OK {
 		return Error(res)
 	}
@@ -256,7 +246,7 @@
 // SetBitrateToMax causes the encoder to use as much rate as it can. This can be
 // useful for controlling the rate by adjusting the output buffer size.
 func (enc *Encoder) SetBitrateToMax() error {
-	res := C.bridge_encoder_set_bitrate(enc.p, C.opus_int32(C.CONST_BITRATE_MAX))
+	res := C.bridge_encoder_set_bitrate(enc.p, C.opus_int32(C.OPUS_BITRATE_MAX))
 	if res != C.OPUS_OK {
 		return Error(res)
 	}
diff --git a/opus.go b/opus.go
index a7436e21befccaf5e536f8d6f7bbc5a041ca8875..e4e67e01901fd3babbd1805b7e674b5680844205 100644
--- a/opus.go
+++ b/opus.go
@@ -8,25 +8,18 @@ /*
 // Link opus using pkg-config.
 #cgo pkg-config: opus
 #include <opus.h>
-
-// Access the preprocessor from CGO
-const int CONST_APPLICATION_VOIP = OPUS_APPLICATION_VOIP;
-const int CONST_APPLICATION_AUDIO = OPUS_APPLICATION_AUDIO;
-const int CONST_APPLICATION_RESTRICTED_LOWDELAY = OPUS_APPLICATION_RESTRICTED_LOWDELAY;
 */
 import "C"
 
 type Application int
 
-// These variables should be constants, but for interoperability with CGO
-// they're var. Don't change them, though!
-var (
+const (
 	// Optimize encoding for VoIP
-	AppVoIP = Application(C.CONST_APPLICATION_VOIP)
+	AppVoIP = Application(C.OPUS_APPLICATION_VOIP)
 	// Optimize encoding for non-voice signals like music
-	AppAudio = Application(C.CONST_APPLICATION_AUDIO)
+	AppAudio = Application(C.OPUS_APPLICATION_AUDIO)
 	// Optimize encoding for low latency applications
-	AppRestrictedLowdelay = Application(C.CONST_APPLICATION_RESTRICTED_LOWDELAY)
+	AppRestrictedLowdelay = Application(C.OPUS_APPLICATION_RESTRICTED_LOWDELAY)
 )
 
 const (