diff --git a/inst/include/Rcpp/vector/Matrix.h b/inst/include/Rcpp/vector/Matrix.h
index 68d1e9bf1..b2448bcb8 100644
--- a/inst/include/Rcpp/vector/Matrix.h
+++ b/inst/include/Rcpp/vector/Matrix.h
@@ -226,11 +226,11 @@ inline std::ostream &operator<<(std::ostream & s, const Matrix<REALSXP, StorageP
         typename MATRIX::Row::iterator jend = row.end();
 
         if (j != jend) {
-            s << std::setw(precision + 1) << (*j);
+            s << std::showpoint << std::setw(precision + 1) << (*j);
             j++;
 
             for ( ; j != jend; j++) {
-                s << " " << std::setw(precision + 1) << (*j);
+                s << " " << std::showpoint << std::setw(precision + 1) << (*j);
             }
         }