diff --git a/src/osgViewer/CompositeViewer.cpp b/src/osgViewer/CompositeViewer.cpp
index efdb6d49a..15ada12c8 100644
--- a/src/osgViewer/CompositeViewer.cpp
+++ b/src/osgViewer/CompositeViewer.cpp
@@ -618,7 +618,7 @@ void CompositeViewer::advance(double simulationTime)
 {
     if (_done) return;
 
-    double prevousReferenceTime = _frameStamp->getReferenceTime();
+    double previousReferenceTime = _frameStamp->getReferenceTime();
     unsigned int previousFrameNumber = _frameStamp->getFrameNumber();
 
 
@@ -638,7 +638,7 @@ void CompositeViewer::advance(double simulationTime)
     if (getViewerStats() && getViewerStats()->collectStats("frame_rate"))
     {
         // update previous frame stats
-        double deltaFrameTime = _frameStamp->getReferenceTime() - prevousReferenceTime;
+        double deltaFrameTime = _frameStamp->getReferenceTime() - previousReferenceTime;
         getViewerStats()->setAttribute(previousFrameNumber, "Frame duration", deltaFrameTime);
         getViewerStats()->setAttribute(previousFrameNumber, "Frame rate", 1.0/deltaFrameTime);
 
diff --git a/src/osgViewer/Viewer.cpp b/src/osgViewer/Viewer.cpp
index 3aeaedae4..1750ed8b8 100644
--- a/src/osgViewer/Viewer.cpp
+++ b/src/osgViewer/Viewer.cpp
@@ -568,7 +568,7 @@ void Viewer::advance(double simulationTime)
 {
     if (_done) return;
 
-    double prevousReferenceTime = _frameStamp->getReferenceTime();
+    double previousReferenceTime = _frameStamp->getReferenceTime();
     unsigned int previousFrameNumber = _frameStamp->getFrameNumber();
 
     _frameStamp->setFrameNumber(_frameStamp->getFrameNumber()+1);
@@ -587,7 +587,7 @@ void Viewer::advance(double simulationTime)
     if (getViewerStats() && getViewerStats()->collectStats("frame_rate"))
     {
         // update previous frame stats
-        double deltaFrameTime = _frameStamp->getReferenceTime() - prevousReferenceTime;
+        double deltaFrameTime = _frameStamp->getReferenceTime() - previousReferenceTime;
         getViewerStats()->setAttribute(previousFrameNumber, "Frame duration", deltaFrameTime);
         getViewerStats()->setAttribute(previousFrameNumber, "Frame rate", 1.0/deltaFrameTime);