diff --git a/cpp/QrSegment.cpp b/cpp/QrSegment.cpp
index 202e6c9..f711461 100644
--- a/cpp/QrSegment.cpp
+++ b/cpp/QrSegment.cpp
@@ -151,7 +151,7 @@ QrSegment QrSegment::makeEci(long assignVal) {
 }
 
 
-QrSegment::QrSegment(const Mode &md, int numCh, const std::vector<bool> &dt) :
+QrSegment::QrSegment(Mode md, int numCh, const std::vector<bool> &dt) :
 		mode(md),
 		numChars(numCh),
 		data(dt) {
@@ -160,7 +160,7 @@ QrSegment::QrSegment(const Mode &md, int numCh, const std::vector<bool> &dt) :
 }
 
 
-QrSegment::QrSegment(const Mode &md, int numCh, std::vector<bool> &&dt) :
+QrSegment::QrSegment(Mode md, int numCh, std::vector<bool> &&dt) :
 		mode(md),
 		numChars(numCh),
 		data(std::move(dt)) {
diff --git a/cpp/QrSegment.hpp b/cpp/QrSegment.hpp
index a19c53f..779f063 100644
--- a/cpp/QrSegment.hpp
+++ b/cpp/QrSegment.hpp
@@ -152,13 +152,13 @@ class QrSegment final {
 	/* 
 	 * Creates a new QR Code data segment with the given parameters and data.
 	 */
-	public: QrSegment(const Mode &md, int numCh, const std::vector<bool> &dt);
+	public: QrSegment(Mode md, int numCh, const std::vector<bool> &dt);
 	
 	
 	/* 
 	 * Creates a new QR Code data segment with the given parameters and data.
 	 */
-	public: QrSegment(const Mode &md, int numCh, std::vector<bool> &&dt);
+	public: QrSegment(Mode md, int numCh, std::vector<bool> &&dt);
 	
 	
 	/*---- Methods ----*/