diff --git a/src/ID3Frames.js b/src/ID3Frames.js
index c858dd4..4a77845 100644
--- a/src/ID3Frames.js
+++ b/src/ID3Frames.js
@@ -566,7 +566,7 @@ module.exports.GEOB = {
         return Buffer.concat(data.map((geob) => {
             return new ID3FrameBuilder("GEOB")
                 .appendStaticNumber(encoding)
-                .appendNullTerminatedValue(geob.mimeType ? geob.mimeType : '')
+                .appendNullTerminatedValue(geob.mimeType ? geob.mimeType : '', 0x00)
                 .appendNullTerminatedValue(geob.filename ? geob.filename : '', encoding)
                 .appendNullTerminatedValue(geob.contentDescription, encoding)
                 .appendStaticValue(geob.encapsulatedObject)