diff --git a/tests/test_stream_exceeds_buffer.cpp b/tests/test_stream_exceeds_buffer.cpp
index 124a84aa..d3604dca 100644
--- a/tests/test_stream_exceeds_buffer.cpp
+++ b/tests/test_stream_exceeds_buffer.cpp
@@ -77,5 +77,7 @@ int main()
     assert(rcvbuf[2]==0xbe);
     assert(rcvbuf[1]==0xad);
     assert(rcvbuf[0]==0xde);
+
+    (void)(rc); // avoid -Wunused-but-set-variable warning in release build
 }