--- trunk/src/applications/sequentialProps/ContactAngle2.cpp	2015/03/07 21:41:51	2071
+++ trunk/src/applications/sequentialProps/ContactAngle2.cpp	2015/03/07 22:54:56	2072
@@ -122,11 +122,14 @@ namespace OpenMD {
       // z is possibly symmetric around 0
       z = pos.z();
           
-      std::size_t whichRBin = int(r / dr);
-      std::size_t whichZBin = int( (zLen/2.0 + z) / dz);
+      int whichRBin = int(r / dr);
+      int whichZBin = int( (zLen/2.0 + z) / dz);
       
-      if ((whichRBin < nRBins_) && (whichZBin >= 0) && (whichZBin < nZBins_)) 
-        histo[whichRBin][whichZBin] += sd->getMass();
+      if ((whichRBin < nRBins_) && (whichZBin >= 0) && (whichZBin < nZBins_)) {
+        std::size_t i = static_cast<std::size_t>(whichRBin);
+        std::size_t j = static_cast<std::size_t>(whichZBin);
+        histo[i][j] += sd->getMass();
+      }
       
     }