diff --git a/tests/oss-fuzz/avif_decode_fuzzer.cc b/tests/oss-fuzz/avif_decode_fuzzer.cc
index 4165745..bb36596 100644
--- a/tests/oss-fuzz/avif_decode_fuzzer.cc
+++ b/tests/oss-fuzz/avif_decode_fuzzer.cc
@@ -25,6 +25,12 @@
     if (result == AVIF_RESULT_OK) {
         for (int loop = 0; loop < 2; ++loop) {
             while (avifDecoderNextImage(decoder) == AVIF_RESULT_OK) {
+                if ((loop != 0) || (decoder->imageIndex != 0)) {
+                    // Skip the YUV<->RGB conversion tests, which are time-consuming for large
+                    // images. It suffices to run these tests only for loop == 0 and only for the
+                    // first image of an image sequence.
+                    continue;
+                }
                 avifRGBImage rgb;
                 avifRGBImageSetDefaults(&rgb, decoder->image);