diff --git a/include/openmc/mesh.h b/include/openmc/mesh.h
index 7a55b5f206..d14987d6d6 100644
--- a/include/openmc/mesh.h
+++ b/include/openmc/mesh.h
@@ -492,7 +492,7 @@ class LibMesh : public UnstructuredMesh {
 public:
   // Constructors
   LibMesh(pugi::xml_node node);
-  LibMesh(const std::string& filename, const double length_multiplier = 1.0);
+  LibMesh(const std::string& filename, double length_multiplier = 1.0);
 
   // Overridden Methods
   void bins_crossed(Position r0, Position r1, const Direction& u,
diff --git a/src/mesh.cpp b/src/mesh.cpp
index 7770dfb865..20a49b1d97 100644
--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@@ -2151,7 +2151,7 @@ LibMesh::LibMesh(pugi::xml_node node) : UnstructuredMesh(node)
   initialize();
 }
 
-LibMesh::LibMesh(const std::string& filename, const double length_multiplier)
+LibMesh::LibMesh(const std::string& filename, double length_multiplier)
 {
   filename_ = filename;
 
@@ -2162,7 +2162,7 @@ LibMesh::LibMesh(const std::string& filename, const double length_multiplier)
   initialize();
 }
 
-void LibMesh::set_length_multiplier(const double length_multiplier)
+void LibMesh::set_length_multiplier(double length_multiplier)
 {
   length_multiplier_ = length_multiplier;
   specified_length_multiplier_ = true;