diff --git a/perf_test/sparse/KokkosSparse_spadd.cpp b/perf_test/sparse/KokkosSparse_spadd.cpp
index c233fbee47..cd96a1162f 100644
--- a/perf_test/sparse/KokkosSparse_spadd.cpp
+++ b/perf_test/sparse/KokkosSparse_spadd.cpp
@@ -242,7 +242,7 @@ void run_experiment(const Params& params)
 #endif
 
   char* cusparseBuffer;
-  int c_nnz;
+  int c_nnz = 0;
   const double alphabeta = 1.0;
 
   for(int sumRep = 0; sumRep < params.repeat; sumRep++)
@@ -493,6 +493,11 @@ int main (int argc, char ** argv){
     throw std::invalid_argument("To run cuSPARSE SpAdd, must supply the '--cuda <device id>' flag");
   }
 
+  if(params.cmtx.length() && params.use_mkl)
+  {
+    throw std::invalid_argument("If running MKL, can't output the result to file");
+  }
+
   bool useSerial = !useOMP && !useCUDA;
 
   if(useOMP)