diff --git a/src/harmonicmaps.cc b/src/harmonicmaps.cc
index a09de7dad9b54c5ab391269ebd79182998c68334..5f24d0dc413efd090099d677d23b32f4df51bf55 100644
--- a/src/harmonicmaps.cc
+++ b/src/harmonicmaps.cc
@@ -116,7 +116,7 @@ int main (int argc, char *argv[]) try
         std::string path                = parameterSet.get<std::string>("path");
         std::string gridFile            = parameterSet.get<std::string>("gridFile");
 
-        grid = shared_ptr<GridType>(AmiraMeshReader<GridType>::read(path + gridFile));
+        grid = shared_ptr<GridType>(AmiraMeshReader<GridType>::read(path + "/" + gridFile));
     }
 
     grid->globalRefine(numLevels-1);