diff --git a/Zend/zend_stream.c b/Zend/zend_stream.c
index f6d6e16072a..dad884a0b51 100644
--- a/Zend/zend_stream.c
+++ b/Zend/zend_stream.c
@@ -85,7 +85,7 @@ int zend_stream_fixup(zend_file_handle *file_handle TSRMLS_DC)
 		file_handle->handle.stream.closer = zend_stream_stdio_closer;
 		file_handle->type = ZEND_HANDLE_STREAM;
 
-		file_handle->handle.stream.interactive = isatty(fileno(file_handle->handle.stream.handle));
+		file_handle->handle.stream.interactive = isatty(fileno((FILE *)file_handle->handle.stream.handle));
 	}
 	return SUCCESS;
 }