diff --git a/lib/Voice/AudioEncoder.js b/lib/Voice/AudioEncoder.js
index c3cf6b939..b2bcf54b1 100644
--- a/lib/Voice/AudioEncoder.js
+++ b/lib/Voice/AudioEncoder.js
@@ -91,7 +91,7 @@ var AudioEncoder = (function () {
 
 			stream.pipe(enc.stdin);
 
-			hookEncodingProcess(resolve, reject, enc, stream);
+			_this.hookEncodingProcess(resolve, reject, enc, stream);
 		});
 	};
 
@@ -103,7 +103,7 @@ var AudioEncoder = (function () {
 
 			var enc = _child_process2["default"].spawn(_this2.getCommand(), ['-i', file, '-f', 's16le', '-ar', '48000', '-ss', options.seek || 0, '-ac', 2, 'pipe:1']);
 
-			hookEncodingProcess(resolve, reject, enc);
+			_this2.hookEncodingProcess(resolve, reject, enc);
 		});
 	};
 
@@ -117,7 +117,7 @@ var AudioEncoder = (function () {
 			var options = ffmpegOptions.concat(['-f', 's16le', '-ar', '48000', '-ac', 2, 'pipe:1']);
 			var enc = _child_process2["default"].spawn(_this3.getCommand(), options);
 
-			hookEncodingProcess(resolve, reject, enc);
+			_this3.hookEncodingProcess(resolve, reject, enc);
 		});
 	};
 
diff --git a/src/Voice/AudioEncoder.js b/src/Voice/AudioEncoder.js
index ef887e2f7..5abf51b0a 100644
--- a/src/Voice/AudioEncoder.js
+++ b/src/Voice/AudioEncoder.js
@@ -73,7 +73,7 @@ export default class AudioEncoder {
 
 			stream.pipe(enc.stdin);
 
-			hookEncodingProcess(resolve, reject, enc, stream);
+			this.hookEncodingProcess(resolve, reject, enc, stream);
 		});
 	}
 
@@ -90,7 +90,7 @@ export default class AudioEncoder {
 				'pipe:1'
 			]);
 
-			hookEncodingProcess(resolve, reject, enc);
+			this.hookEncodingProcess(resolve, reject, enc);
 		});
 	}
 
@@ -107,7 +107,7 @@ export default class AudioEncoder {
 			]);
 			var enc = cpoc.spawn(this.getCommand(), options);
 
-			hookEncodingProcess(resolve, reject, enc);
+			this.hookEncodingProcess(resolve, reject, enc);
 		});
 	}