diff --git a/Box_intersection_d/test/Box_intersection_d/util.h b/Box_intersection_d/test/Box_intersection_d/util.h
index 78310bdad0b..6f1b351f6c8 100644
--- a/Box_intersection_d/test/Box_intersection_d/util.h
+++ b/Box_intersection_d/test/Box_intersection_d/util.h
@@ -32,8 +32,10 @@ struct Util {
       std::vector< int > minc( numDim ), maxc( numDim );
       /* Read boxes */
       for(boxNum = 0; boxNum < numBoxes; boxNum++) {
-          for(dim = 0; dim < numDim; dim++)
-              (void)std::fscanf( infile, "[%d, %d) ", &minc[dim], &maxc[dim] );
+          for(dim = 0; dim < numDim; dim++) {
+              n = std::fscanf( infile, "[%d, %d) ", &minc[dim], &maxc[dim] );
+              assert( n == 2);
+          }
           boxes.push_back( Box( &minc[0], &maxc[0] ) );
           n = std::fscanf(infile, "\n");
           assert(n == 0);