diff --git a/indra/newview/llappviewer.cpp b/indra/newview/llappviewer.cpp
index a8b9a118d0..04ae70d1ea 100644
--- a/indra/newview/llappviewer.cpp
+++ b/indra/newview/llappviewer.cpp
@@ -1707,7 +1707,7 @@ bool LLAppViewer::doFrame()
 		}
 		// Check if we need to temporarily enable rendering.
 		//F32 periodic_rendering = gSavedSettings.getF32("ForcePeriodicRenderingTime");
-		static LLCachedControl<F32> periodic_rendering(gSavedSettings, "ForcePeriodicRenderingTime");
+		static LLCachedControl<F32> periodic_rendering(gSavedSettings, "ForcePeriodicRenderingTime", -1.f);
 		if (periodic_rendering > F_APPROXIMATELY_ZERO && periodicRenderingTimer.getElapsedTimeF64() > periodic_rendering)
 		{
 			periodicRenderingTimer.reset();