diff --git a/codecs/codecs.js b/codecs/codecs.js
index 7354497..c41e6b3 100644
--- a/codecs/codecs.js
+++ b/codecs/codecs.js
@@ -127,8 +127,7 @@ export function getFullMIMEString(info) {
             case 'opus': codecFrags.add('opus'); break;
             // I'm going off of what Chromium calls this one, with the dash.
             case 'ac3': codecFrags.add('ac-3'); break;
-            // It seems to be "fLaC".
-            case 'flac': codecFrags.add(stream.codec_tag_string); break;
+            case 'flac': codecFrags.add('flac'); break;
             default:
               throw `Could not handle audio codec_name ${stream.codec_name}, ` +
                     `codec_tag_string ${stream.codec_tag_string} for file ${info.format.filename} yet. ` +
diff --git a/tests/codecs.spec.js b/tests/codecs.spec.js
index efe9fb8..c84fa58 100644
--- a/tests/codecs.spec.js
+++ b/tests/codecs.spec.js
@@ -360,7 +360,7 @@ describe('codecs test suite', () => {
       info.streams[0].codec_name = 'flac';
       expect(getFullMIMEString(info))
           .to.be.a('string')
-          .and.equals('audio/mp4; codecs="fLaC"');
+          .and.equals('audio/mp4; codecs="flac"');
     });
 
     it('video/mp4 handles fLaC', () => {
@@ -373,7 +373,7 @@ describe('codecs test suite', () => {
       });
       expect(getFullMIMEString(vInfo))
           .to.be.a('string')
-          .and.equals('video/mp4; codecs="fLaC"');
+          .and.equals('video/mp4; codecs="flac"');
       
     });
   });