diff --git a/owlps-positioning/src/stock.cc b/owlps-positioning/src/stock.cc
index e0d8df9..dee9a44 100644
--- a/owlps-positioning/src/stock.cc
+++ b/owlps-positioning/src/stock.cc
@@ -152,6 +152,19 @@ const Mobile& Stock::find_create_mobile(const string &mac)
 /* *** AccessPoint operations *** */
 
 
+/**
+ * @param mac The MAC address of the AccessPoint to search for.
+ * It must be a valid MAC address, as no check is performed.
+ * @return \em true if an AP with this MAC address exists.
+ * @return \em false if this MAC address was not found.
+ */
+bool Stock::ap_exists(const std::string &mac)
+{
+  unordered_map<string, AccessPoint>::const_iterator i = aps.find(mac) ;
+  return i != aps.end() ;
+}
+
+
 /**
  * @param mac The MAC address of the AccessPoint to search for.
  * It must be a valid MAC address, as no check is performed.
diff --git a/owlps-positioning/src/stock.hh b/owlps-positioning/src/stock.hh
index 33b1021..ab4cbab 100644
--- a/owlps-positioning/src/stock.hh
+++ b/owlps-positioning/src/stock.hh
@@ -81,6 +81,8 @@ public:
   //@{
   /// Returns the number of access points
   static unsigned int nb_aps(void) ;
+  /// Verify the existence of an AP
+  static bool ap_exists(const std::string &mac) ;
   /// Reads the AccessPoint corresponding to a given MAC address
   static const AccessPoint& get_ap(const std::string &mac) ;
   /// \brief Searches for an AccessPoint given its MAC address and