diff --git a/indra/llcommon/llsys.cpp b/indra/llcommon/llsys.cpp
index 10beb00113d12c61261a912aac3aa759082e45cc..1f87c3ae0605a80a89439672eaba6a7a93d3921e 100755
--- a/indra/llcommon/llsys.cpp
+++ b/indra/llcommon/llsys.cpp
@@ -1398,6 +1398,8 @@ class FrameWatcher
         }
         LL_CONT << std::fixed << std::setprecision(1) << framerate << '\n'
                 << LLMemoryInfo() << LL_ENDL;
+#else
+	(void)prevSize;
 #endif
 
         return false;