diff --git a/owlps-positioner/posutil.cc b/owlps-positioner/posutil.cc
index 9a21208..885cec2 100644
--- a/owlps-positioner/posutil.cc
+++ b/owlps-positioner/posutil.cc
@@ -119,7 +119,7 @@ float PosUtil::similarity(
 /**
  * @param channel A IEEE 802.11 channel or frequency in MHz or in Hz.
  * @returns The frequency in Hz.
- * @throw malformed_input_data if `channel` is not a valid channel or
+ * @throw bad_channel if `channel` is not a valid channel or
  * frequency value.
  */
 unsigned long PosUtil::wifi_channel_to_hz(const unsigned long &channel)
diff --git a/owlps-positioner/tests/posutil_test.hh b/owlps-positioner/tests/posutil_test.hh
index b131f99..7a0cb09 100644
--- a/owlps-positioner/tests/posutil_test.hh
+++ b/owlps-positioner/tests/posutil_test.hh
@@ -9,10 +9,8 @@ public:
   void test_wifi(void)
   {
     // Bad values
-    TS_ASSERT_EQUALS(PosUtil::wifi_channel_to_hz(0),
-                     static_cast<unsigned int>(0)) ;
-    TS_ASSERT_EQUALS(PosUtil::wifi_channel_to_hz(15),
-                     static_cast<unsigned int>(0)) ;
+    TS_ASSERT_THROWS(PosUtil::wifi_channel_to_hz(0), bad_channel) ;
+    TS_ASSERT_THROWS(PosUtil::wifi_channel_to_hz(15), bad_channel) ;
 
     // Good values
     for (unsigned int i = 1 ; i < 15 ; ++i)