diff --git a/src/wp-includes/class-pop3.php b/src/wp-includes/class-pop3.php
index 2fa60110e2..7a72b1caf8 100644
--- a/src/wp-includes/class-pop3.php
+++ b/src/wp-includes/class-pop3.php
@@ -59,7 +59,9 @@ class POP3 {
         if(!empty($timeout)) {
             settype($timeout,"integer");
             $this->TIMEOUT = $timeout;
-            set_time_limit($timeout);
+            if(function_exists("set_time_limit")){
+                set_time_limit($timeout);
+            }
         }
         return true;
     }
@@ -72,7 +74,9 @@ class POP3 {
 	}
 
     function update_timer () {
-        set_time_limit($this->TIMEOUT);
+        if(function_exists("set_time_limit")){
+            set_time_limit($this->TIMEOUT);
+        }
         return true;
     }