diff --git a/src/Matrix.cpp b/src/Matrix.cpp
index 38c2460..6e78ecc 100644
--- a/src/Matrix.cpp
+++ b/src/Matrix.cpp
@@ -451,6 +451,7 @@ namespace Aurora {
                         mark = "";
                     }
                     ::printf("%s%f2i",mark,value);
+                    mark = "+";
                 }
                 ::printf(", ");
             }