diff --git a/src/recur.cpp b/src/recur.cpp
index 3267032d2..182356c91 100644
--- a/src/recur.cpp
+++ b/src/recur.cpp
@@ -40,7 +40,7 @@
 
 #include <Context.h>
 #include <Date.h>
-#include <Duration.h>
+#include <ISO8601.h>
 #include <Lexer.h>
 #include <ISO8601.h>
 #include <text.h>
@@ -368,27 +368,14 @@ Date getNextRecurrence (Date& current, std::string& period)
     return Date (m, d, y);
   }
 
-  // If the period is an 'easy' one, add it to current, and we're done.
-  // If it throws an error, the duration was not recognized.
+  // Add the period to current, and we're done.
   int secs = 0;
   std::string::size_type idx = 0;
-  Duration du;
-  if (du.parse (period, idx))
-  {
-    secs = du;
-  }
-  else
-  {
-    idx = 0;
-    ISO8601p p;
-    if (p.parse (period, idx))
-    {
-      secs = p;
-    }
-    else
-      throw std::string (format (STRING_TASK_VALID_RECUR, period));
-  }
+  ISO8601p p;
+  if (! p.parse (period, idx))
+    throw std::string (format (STRING_TASK_VALID_RECUR, period));
 
+  secs = (time_t) p;
   return current + secs;
 }