diff --git a/vcg/math/lin_algebra.h b/vcg/math/lin_algebra.h
index 0f9c8422..bd301f7b 100644
--- a/vcg/math/lin_algebra.h
+++ b/vcg/math/lin_algebra.h
@@ -82,7 +82,7 @@ namespace vcg
 							JacobiRotate<TYPE>(w,s,tau,ip,j,iq,j);
 						} 
 						for (j=0;j<4;j++) { 
-							JacobiRotate<TYPE>(w,s,tau,j,ip,j,iq);
+							JacobiRotate<TYPE>(v,s,tau,j,ip,j,iq);
 						} 
 						++nrot; 
 					}