diff --git a/src/epanet.c b/src/epanet.c
index 0179b7e..8e5f183 100644
--- a/src/epanet.c
+++ b/src/epanet.c
@@ -2628,8 +2628,8 @@ int DLLEXPORT EN_settankdata(EN_Project p, int index, double elev,
     Network *net = &p->network;
 
     int i, j, n, curveIndex = 0;
-    double area, elevation = elev / Ucf[ELEV];
     double *Ucf = p->Ucf;
+    double area, elevation = elev / Ucf[ELEV];
     Stank *Tank = net->Tank;
     Scurve *curve;