diff --git a/test/call_config_utils_unittest.cc b/test/call_config_utils_unittest.cc
index afc48c4..dbefc9b 100644
--- a/test/call_config_utils_unittest.cc
+++ b/test/call_config_utils_unittest.cc
@@ -22,7 +22,7 @@
   VideoReceiveStream::Decoder decoder;
   decoder.payload_type = 10;
   decoder.video_format.name = "test";
-  decoder.video_format.parameters["99"] = 98;
+  decoder.video_format.parameters["99"] = "b";
   recv_config.decoders.push_back(decoder);
   recv_config.render_delay_ms = 10;
   recv_config.target_delay_ms = 15;