diff --git a/inc/RRule.php b/inc/RRule.php
index a3432a68..61610c01 100644
--- a/inc/RRule.php
+++ b/inc/RRule.php
@@ -674,18 +674,20 @@ class RepeatRule {
     if ( preg_match('{BYHOUR=([0-9,]+)(;|$)}', $rrule, $m) ) $this->byhour = explode(',',$m[1]);
 
     if ( !isset($this->interval) ) $this->interval = 1;
+
+    $freq_name = null;
     switch( $this->freq ) {
-      case 'SECONDLY': $this->freq_name = 'second'; break;
-      case 'MINUTELY': $this->freq_name = 'minute'; break;
-      case 'HOURLY':   $this->freq_name = 'hour';   break;
-      case 'DAILY':    $this->freq_name = 'day';    break;
-      case 'WEEKLY':   $this->freq_name = 'week';   break;
-      case 'MONTHLY':  $this->freq_name = 'month';  break;
-      case 'YEARLY':   $this->freq_name = 'year';   break;
+      case 'SECONDLY': $freq_name = 'second'; break;
+      case 'MINUTELY': $freq_name = 'minute'; break;
+      case 'HOURLY':   $freq_name = 'hour';   break;
+      case 'DAILY':    $freq_name = 'day';    break;
+      case 'WEEKLY':   $freq_name = 'week';   break;
+      case 'MONTHLY':  $freq_name = 'month';  break;
+      case 'YEARLY':   $freq_name = 'year';   break;
       default:
         /** need to handle the error, but FREQ is mandatory so unlikely */
     }
-    $this->frequency_string = sprintf('+%d %s', $this->interval, $this->freq_name );
+    $this->frequency_string = sprintf('+%d %s', $this->interval, $freq_name );
     if ( DEBUG_RRULE ) printf( "Frequency modify string is: '%s', base is: '%s', TZ: %s\n", $this->frequency_string, $this->base->format('c'), $this->base->getTimeZone() );
     $this->Start($return_floating_times);
   }