diff --git a/owlps-positioning/src/result.hh b/owlps-positioning/src/result.hh
index 89573eb..680ec9c 100644
--- a/owlps-positioning/src/result.hh
+++ b/owlps-positioning/src/result.hh
@@ -21,8 +21,8 @@ public:
 
   /** @name Read accessors */
   //@{
-  const Point3D& get_position(void) ;
-  const Request* get_request(void) ;
+  const Point3D& get_position(void) const ;
+  const Request* get_request(void) const ;
   //@}
 
   /** @name Operators */
@@ -41,13 +41,13 @@ public:
 /* *** Read accessors *** */
 
 
-inline const Point3D& Result::get_position()
+inline const Point3D& Result::get_position() const
 {
   return position ;
 }
 
 
-inline const Request* Result::get_request()
+inline const Request* Result::get_request() const
 {
   return request ;
 }