diff --git a/unsupported/Eigen/src/SparseExtra/MarketIO.h b/unsupported/Eigen/src/SparseExtra/MarketIO.h
index fc70a24d8..6d57ab2e9 100644
--- a/unsupported/Eigen/src/SparseExtra/MarketIO.h
+++ b/unsupported/Eigen/src/SparseExtra/MarketIO.h
@@ -109,6 +109,7 @@ namespace internal
 inline bool getMarketHeader(const std::string& filename, int& sym, bool& iscomplex, bool& isvector)
 {
   sym = 0; 
+  iscomplex = false;
   isvector = false;
   std::ifstream in(filename.c_str(),std::ios::in);
   if(!in)