diff --git a/tools/target_dec_fuzzer.c b/tools/target_dec_fuzzer.c
index a9472eebe6..e8f344bb8f 100644
--- a/tools/target_dec_fuzzer.c
+++ b/tools/target_dec_fuzzer.c
@@ -274,6 +274,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     case AV_CODEC_ID_SCPR:        maxpixels  /= 32;    break;
     case AV_CODEC_ID_SCREENPRESSO:maxpixels  /= 64;    break;
     case AV_CODEC_ID_SIMBIOSIS_IMX:maxpixels /= 16384; break;
+    case AV_CODEC_ID_SPEEX:       maxsamples /= 128;   break;
     case AV_CODEC_ID_SMACKAUDIO:  maxsamples /= 4096;  break;
     case AV_CODEC_ID_SMACKVIDEO:  maxpixels  /= 64;    break;
     case AV_CODEC_ID_SNOW:        maxpixels  /= 128;   break;