diff --git a/lib/Horde/Stream/Wrapper/Combine.php b/lib/Horde/Stream/Wrapper/Combine.php
index 80b723df..d7a4a751 100644
--- a/lib/Horde/Stream/Wrapper/Combine.php
+++ b/lib/Horde/Stream/Wrapper/Combine.php
@@ -171,9 +171,11 @@ public function stream_read($count)
             }
 
             $curr_read = min($count, $tmp['l'] - $tmp['p']);
-            $out .= fread($tmp['fp'], $curr_read);
-            $count -= $curr_read;
-            $this->_position += $curr_read;
+            if ($curr_read > 0) {
+                $out .= fread($tmp['fp'], $curr_read);
+                $count -= $curr_read;
+                $this->_position += $curr_read;
+            }
 
             if ($this->_position == $this->_length) {
                 if ($count) {