diff --git a/diffmodels.h b/diffmodels.h
index ddf530b0e2c30c3df47968fbb343fce072be6bbd..fab457f2c60c6e33604fe4560fe95895b0e27082 100644
--- a/diffmodels.h
+++ b/diffmodels.h
@@ -232,7 +232,7 @@ protected:
   ColumnVector cosalpha;
   ColumnVector beta;
   
-  float npts;
+  int   npts;
   int   nfib;
 
 };