diff --git a/src/Task.cpp b/src/Task.cpp
index 210bc0685..3f0f81dec 100644
--- a/src/Task.cpp
+++ b/src/Task.cpp
@@ -1646,7 +1646,8 @@ void Task::validate (bool applyDefault /* = true */)
       Duration p;
       std::string::size_type i = 0;
       if (! p.parse (value, i))
-        throw format (STRING_TASK_VALID_RECUR, value);
+        // TODO Ideal location to map unsupported old recurrence periods to supported values.
+        throw format ("The recurrence value '{1}' is not valid.", value);
     }
   }
 }
diff --git a/src/l10n/deu-DEU.h b/src/l10n/deu-DEU.h
index cae7db4a2..7b26d49c6 100644
--- a/src/l10n/deu-DEU.h
+++ b/src/l10n/deu-DEU.h
@@ -687,7 +687,6 @@
 #define STRING_TASK_VALID_BLANK      "Leere Aufgaben können nicht angelegt werden."
 #define STRING_TASK_VALID_BEFORE     "Warnung: Das '{1}'-Datum ist nach dem '{2}'-Datum."
 #define STRING_TASK_VALID_REC_DUE    "Wiederholende Aufgaben müssen eine Fälligkeit besitzen."
-#define STRING_TASK_VALID_RECUR      "Wiederhol-Periode '{1}' ist ungültig."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Befehl an Ausführung gehindert."
 #define STRING_TASK_SAFETY_ALLOW     "Kein Filter angegeben, und durch den konfigurierten 'allow.empty.filter'-Wert wurde keine Aktion durchgeführt."
diff --git a/src/l10n/eng-USA.h b/src/l10n/eng-USA.h
index 3a072a903..a0a5c0e77 100644
--- a/src/l10n/eng-USA.h
+++ b/src/l10n/eng-USA.h
@@ -684,7 +684,6 @@
 #define STRING_TASK_VALID_BLANK      "Cannot add a task that is blank."
 #define STRING_TASK_VALID_BEFORE     "Warning: You have specified that the '{1}' date is after the '{2}' date."
 #define STRING_TASK_VALID_REC_DUE    "A recurring task must also have a 'due' date."
-#define STRING_TASK_VALID_RECUR      "The recurrence value '{1}' is not valid."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Command prevented from running."
 #define STRING_TASK_SAFETY_ALLOW     "You did not specify a filter, and with the 'allow.empty.filter' value, no action is taken."
diff --git a/src/l10n/epo-RUS.h b/src/l10n/epo-RUS.h
index 480d548f4..33b85c713 100644
--- a/src/l10n/epo-RUS.h
+++ b/src/l10n/epo-RUS.h
@@ -687,7 +687,6 @@
 #define STRING_TASK_VALID_BLANK      "Ne povas krei blankan taskon."
 #define STRING_TASK_VALID_BEFORE     "Averto: Vi specifis daton '{1}' post dato '{2}'."
 #define STRING_TASK_VALID_REC_DUE    "Reokazanta tasko devas ankaŭ havi daton 'due'."
-#define STRING_TASK_VALID_RECUR      "Reokaz-valoro '{1}' ne estas valida."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Antaŭmalebligis komandon."
 #define STRING_TASK_SAFETY_ALLOW     "Vi ne specifis filtrilon. Laŭ la valoro 'allow.empty.filter', ne faros nenion."
diff --git a/src/l10n/esp-ESP.h b/src/l10n/esp-ESP.h
index b500f8cad..5ea626298 100644
--- a/src/l10n/esp-ESP.h
+++ b/src/l10n/esp-ESP.h
@@ -699,7 +699,6 @@
 #define STRING_TASK_VALID_BLANK      "No se puede añadir una tarea que está en blanco."
 #define STRING_TASK_VALID_BEFORE     "Advertencia: ha especificado que la fecha '{1}' es después de la fecha '{2}'."
 #define STRING_TASK_VALID_REC_DUE    "Una tarea recurrente debe tener también una fecha de vencimiento."
-#define STRING_TASK_VALID_RECUR      "El valor de recurrencia '{1}' no es válido."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Se impidió la ejecución del comando."
 #define STRING_TASK_SAFETY_ALLOW     "No especificó un filtro, y con el valor de 'allow.empty.filter', no se toma ninguna acción."
diff --git a/src/l10n/fra-FRA.h b/src/l10n/fra-FRA.h
index 01175e410..19843eda0 100644
--- a/src/l10n/fra-FRA.h
+++ b/src/l10n/fra-FRA.h
@@ -689,7 +689,6 @@
 #define STRING_TASK_VALID_BLANK      "Cannot add a task that is blank."
 #define STRING_TASK_VALID_BEFORE     "Warning: You have specified that the '{1}' date is after the '{2}' date."
 #define STRING_TASK_VALID_REC_DUE    "A recurring task must also have a 'due' date."
-#define STRING_TASK_VALID_RECUR      "The recurrence value '{1}' is not valid."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Command prevented from running."
 #define STRING_TASK_SAFETY_ALLOW     "You did not specify a filter, and with the 'allow.empty.filter' value, no action is taken."
diff --git a/src/l10n/ita-ITA.h b/src/l10n/ita-ITA.h
index 8a0da1411..0a4de2151 100644
--- a/src/l10n/ita-ITA.h
+++ b/src/l10n/ita-ITA.h
@@ -688,7 +688,6 @@
 #define STRING_TASK_VALID_BLANK      "Impossibile aggiungere un task vuoto."
 #define STRING_TASK_VALID_BEFORE     "Warning: data '{1}' con valore successivo alla data '{2}'."
 #define STRING_TASK_VALID_REC_DUE    "Un task periodico deve avere una data di scadenza."
-#define STRING_TASK_VALID_RECUR      "Il valore di periodicità '{1}' non è valido."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Prevenuta l'esecuzione del comando."
 #define STRING_TASK_SAFETY_ALLOW     "You did not specify a filter, and with the 'allow.empty.filter' value, no action is taken."
diff --git a/src/l10n/jpn-JPN.h b/src/l10n/jpn-JPN.h
index ac522d3b2..6e22afdac 100644
--- a/src/l10n/jpn-JPN.h
+++ b/src/l10n/jpn-JPN.h
@@ -689,7 +689,6 @@
 #define STRING_TASK_VALID_BLANK      "Cannot add a task that is blank."
 #define STRING_TASK_VALID_BEFORE     "Warning: You have specified that the '{1}' date is after the '{2}' date."
 #define STRING_TASK_VALID_REC_DUE    "A recurring task must also have a 'due' date."
-#define STRING_TASK_VALID_RECUR      "The recurrence value '{1}' is not valid."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "コマンドの実行は中止された。"
 #define STRING_TASK_SAFETY_ALLOW     "You did not specify a filter, and with the 'allow.empty.filter' value, no action is taken."
diff --git a/src/l10n/pol-POL.h b/src/l10n/pol-POL.h
index d3dc3b4a1..e0247ab39 100644
--- a/src/l10n/pol-POL.h
+++ b/src/l10n/pol-POL.h
@@ -689,7 +689,6 @@
 #define STRING_TASK_VALID_BLANK      "Nie można dodać pustego zadania."
 #define STRING_TASK_VALID_BEFORE     "Uwaga: podałeś datę '{1}' jako datę po '{2}'."
 #define STRING_TASK_VALID_REC_DUE    "Zadanie cykliczne musi posiadać datę zakończenia."
-#define STRING_TASK_VALID_RECUR      "Wartość '{1}' określająca okres zadania jest niepoprawna."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Niedopuszczono do wykonania polecenia."
 #define STRING_TASK_SAFETY_ALLOW     "Brak filtra, z aktywną flagą 'allow.empty.filter', nie podjęto akcji."
diff --git a/src/l10n/por-PRT.h b/src/l10n/por-PRT.h
index fa07c825e..b1358d7da 100644
--- a/src/l10n/por-PRT.h
+++ b/src/l10n/por-PRT.h
@@ -689,7 +689,6 @@
 #define STRING_TASK_VALID_BLANK      "Não é possível adicionar uma tarefa em branco."
 #define STRING_TASK_VALID_BEFORE     "Aviso: Especificou que a data de '{1}' é posterior à data de '{2}'."
 #define STRING_TASK_VALID_REC_DUE    "Uma tarefa recorrente necessita de uma data de vencimento."
-#define STRING_TASK_VALID_RECUR      "O valor de recorrência '{1}' não é válido."
 #define STRING_TASK_SAFETY_VALVE     "This command has no filter, and will modify all (including completed and deleted) tasks.  Are you sure?"
 #define STRING_TASK_SAFETY_FAIL      "Execução do comando abortada."
 #define STRING_TASK_SAFETY_ALLOW     "Não especificou um filtro e com o valor de 'allow.empty.filter', nenhuma ação foi tomada."
diff --git a/src/recur.cpp b/src/recur.cpp
index 32a80b140..422cdbc8a 100644
--- a/src/recur.cpp
+++ b/src/recur.cpp
@@ -368,7 +368,7 @@ Datetime getNextRecurrence (Datetime& current, std::string& period)
   std::string::size_type idx = 0;
   Duration p;
   if (! p.parse (period, idx))
-    throw std::string (format (STRING_TASK_VALID_RECUR, period));
+    throw std::string (format ("The recurrence value '{1}' is not valid.", period));
 
   return current + p.toTime_t ();
 }