diff --git a/libavformat/r3d.c b/libavformat/r3d.c
index 8459cddc70..0719fb601a 100644
--- a/libavformat/r3d.c
+++ b/libavformat/r3d.c
@@ -85,7 +85,7 @@ static int r3d_read_red1(AVFormatContext *s)
 
     framerate.num = avio_rb16(s->pb);
     framerate.den = avio_rb16(s->pb);
-    if (framerate.num && framerate.den) {
+    if (framerate.num > 0 && framerate.den > 0) {
 #if FF_API_R_FRAME_RATE
         st->r_frame_rate =
 #endif
@@ -283,8 +283,8 @@ static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
     dts = avio_rb32(s->pb);
 
     st->codec->sample_rate = avio_rb32(s->pb);
-    if (st->codec->sample_rate < 0) {
-        av_log(s, AV_LOG_ERROR, "negative sample rate\n");
+    if (st->codec->sample_rate <= 0) {
+        av_log(s, AV_LOG_ERROR, "Bad sample rate\n");
         return AVERROR_INVALIDDATA;
     }