diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c
index 07f5452157..96894bf7fd 100644
--- a/libavcodec/pngenc.c
+++ b/libavcodec/pngenc.c
@@ -323,7 +323,7 @@ static int png_get_chrm(enum AVColorPrimaries prim,  uint8_t *buf)
 
 static int png_get_gama(enum AVColorTransferCharacteristic trc, uint8_t *buf)
 {
-    double gamma = av_csp_approximate_trc_gamma(trc);
+    double gamma = av_csp_approximate_eotf_gamma(trc);
     if (gamma <= 1e-6)
         return 0;
 
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 7d5d8f27e2..eabc1b95ca 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2523,7 +2523,7 @@ static int mov_write_gama_tag(AVFormatContext *s, AVIOContext *pb, MOVTrack *tra
 {
     uint32_t gama = 0;
     if (gamma <= 0.0)
-        gamma = av_csp_approximate_trc_gamma(track->par->color_trc);
+        gamma = av_csp_approximate_eotf_gamma(track->par->color_trc);
     av_log(s, AV_LOG_DEBUG, "gamma value %g\n", gamma);
 
     if (gamma > 1e-6) {