diff --git a/importexport/inc/class.importexport_schedule_ui.inc.php b/importexport/inc/class.importexport_schedule_ui.inc.php
index 8151079577..40e079ea4f 100644
--- a/importexport/inc/class.importexport_schedule_ui.inc.php
+++ b/importexport/inc/class.importexport_schedule_ui.inc.php
@@ -528,6 +528,15 @@ class importexport_schedule_ui
 			{
 				if (($resource = @fopen( $target, $data['type'] == 'import' ? 'rb' : 'wb' )))
 				{
+					// if steam is NOT seekable (e.g. http), copy it into temp stream, which is
+					if ($data['type'] == 'import' && ($metadata=stream_get_meta_data($resource)) &&
+						!$metadata['seekable'] && ($tmp = fopen('php://temp', 'r+')))
+					{
+						stream_copy_to_stream($resource, $tmp);
+						fclose($resource);
+						fseek($tmp, 0);
+						$resource = $tmp;
+					}
 					$result = $po->$type( $resource, $definition );
 
 					fclose($resource);
@@ -685,4 +694,4 @@ class importexport_schedule_ui
 		}
 		return $result;
 	}
-}
+}
\ No newline at end of file