diff --git a/libs/panners/1in2out/panner_1in2out.cc b/libs/panners/1in2out/panner_1in2out.cc
index 12e7896cfb..4dd21493e6 100644
--- a/libs/panners/1in2out/panner_1in2out.cc
+++ b/libs/panners/1in2out/panner_1in2out.cc
@@ -385,7 +385,7 @@ Panner1in2out::value_as_string (boost::shared_ptr<AutomationControl> ac) const
                                        (int) rint (100.0 * val));
                 
         default:
-                return _pannable->value_as_string (ac);
+                return _("unused");
         }
 }
 
diff --git a/libs/panners/2in2out/panner_2in2out.cc b/libs/panners/2in2out/panner_2in2out.cc
index 463b2671bb..860610ecfc 100644
--- a/libs/panners/2in2out/panner_2in2out.cc
+++ b/libs/panners/2in2out/panner_2in2out.cc
@@ -529,7 +529,7 @@ Panner2in2out::value_as_string (boost::shared_ptr<AutomationControl> ac) const
                 return string_compose (_("Width: %1%%"), (int) floor (100.0 * val));
                 
         default:
-                return _pannable->value_as_string (ac);
+                return _("unused");
         }
 }
 
diff --git a/libs/panners/stereobalance/panner_balance.cc b/libs/panners/stereobalance/panner_balance.cc
index d5ab96b73c..b7d8a2a031 100644
--- a/libs/panners/stereobalance/panner_balance.cc
+++ b/libs/panners/stereobalance/panner_balance.cc
@@ -321,7 +321,7 @@ Pannerbalance::value_as_string (boost::shared_ptr<AutomationControl> ac) const
 					(int) rint (100.0 * val));
 
 		default:
-			return _pannable->value_as_string (ac);
+			return _("unused");
 	}
 }
 
diff --git a/libs/panners/vbap/vbap.cc b/libs/panners/vbap/vbap.cc
index 2ab91cf3c4..b092be29d0 100644
--- a/libs/panners/vbap/vbap.cc
+++ b/libs/panners/vbap/vbap.cc
@@ -430,7 +430,7 @@ VBAPanner::value_as_string (boost::shared_ptr<AutomationControl> ac) const
                 return string_compose (_("%1\u00B0"), (int) floor (90.0 * fabs(val)));
                 
         default:
-                return _pannable->value_as_string (ac);
+                return _("unused");
         }
 }