diff --git a/tracy/tools/max4.cc b/tracy/tools/max4.cc
index 436aee875f952be07455783817ec58b55a501c24..148e40ea849fbdca877b2a04011ee363b09b1f85 100644
--- a/tracy/tools/max4.cc
+++ b/tracy/tools/max4.cc
@@ -352,7 +352,7 @@ prtmfile("flat_file.dat"); // writes flat file   /* very important file for debu
     double  sum_delta[globval.Cell_nLoc+1][2];
     double  sum2_delta[globval.Cell_nLoc+1][2];
     
-    GetEmittance(ElemIndex("cav"), true);
+    GetEmittance(globval.cav, true);
     
     // initialize momentum aperture arrays
     for(k = 0; k <= globval.Cell_nLoc; k++){