diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/ts/Ac3Reader.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/ts/Ac3Reader.java
index 1d88c2bdea..cbd12f25d0 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/ts/Ac3Reader.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/ts/Ac3Reader.java
@@ -199,7 +199,7 @@ public final class Ac3Reader implements ElementaryStreamReader {
     if (format == null
         || frameInfo.channelCount != format.channelCount
         || frameInfo.sampleRate != format.sampleRate
-        || Util.areEqual(frameInfo.mimeType, format.sampleMimeType)) {
+        || !Util.areEqual(frameInfo.mimeType, format.sampleMimeType)) {
       format =
           Format.createAudioSampleFormat(
               formatId,