diff --git a/wp-ffpc-class.php b/wp-ffpc-class.php
index d1c0bb2..ff5e33c 100644
--- a/wp-ffpc-class.php
+++ b/wp-ffpc-class.php
@@ -975,6 +975,14 @@ class WP_FFPC extends PluginAbstract {
 	 */
 	private function deploy_advanced_cache( ) {
 
+		/* check that WP_CONTENT_DIR is writable */
+		if ( ! @is_writable( WP_CONTENT_DIR ))
+			return false;
+
+		/* check that advanced-cache.php is writable if advanced-cache.php exists */
+		if ( @file_exists( $this->acache ) && ! @is_writable( $this->acache ))
+			return false;
+
 		/* if no active site left no need for advanced cache :( */
 		if ( empty ( $this->global_config ) ) {
 			unlink ( $this->acache );