diff --git a/NEWS b/NEWS
index 32a4eed6e..92204f996 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,7 @@ ver 0.21.20 (not yet released)
   - audiofile, ffmpeg, sndfile: handle MIME type "audio/wav"
   - ffmpeg: fix playback of AIFF and TTA
   - vorbis, opus: fix seeking in small files
+* fix backwards seeking on ARM (and other non-x86 CPUs)
 
 ver 0.21.19 (2020/01/17)
 * configuration
diff --git a/src/protocol/ArgParser.cxx b/src/protocol/ArgParser.cxx
index b162c1984..fdd2b4a5d 100644
--- a/src/protocol/ArgParser.cxx
+++ b/src/protocol/ArgParser.cxx
@@ -175,5 +175,5 @@ SignedSongTime
 ParseCommandArgSignedSongTime(const char *s)
 {
 	auto value = ParseCommandArgFloat(s);
-	return SongTime::FromS(value);
+	return SignedSongTime::FromS(value);
 }