diff --git a/SignalServiceKit/src/Util/MIMETypeUtil.m b/SignalServiceKit/src/Util/MIMETypeUtil.m
index 2127724ae..e107e2137 100644
--- a/SignalServiceKit/src/Util/MIMETypeUtil.m
+++ b/SignalServiceKit/src/Util/MIMETypeUtil.m
@@ -62,7 +62,6 @@ NSString *const kSyncMessageFileExtension = @"bin";
             @"audio/mpeg3" : @"mp3",
             @"audio/x-mp3" : @"mp3",
             @"audio/x-mpeg3" : @"mp3",
-            @"audio/amr" : @"amr",
             @"audio/aiff" : @"aiff",
             @"audio/x-aiff" : @"aiff",
             @"audio/3gpp2" : @"3g2",
@@ -143,7 +142,6 @@ NSString *const kSyncMessageFileExtension = @"bin";
             @"aif" : @"audio/aiff",
             @"aifc" : @"audio/aiff",
             @"cdda" : @"audio/aiff",
-            @"amr" : @"audio/amr",
             @"mp3" : @"audio/mp3",
             @"swa" : @"audio/mp3",
             @"mp4" : @"audio/mp4",