diff --git a/SConstruct b/SConstruct
index f2e07863..b0d7a978 100644
--- a/SConstruct
+++ b/SConstruct
@@ -7,6 +7,7 @@ import sys
 import platform
 
 TICI = os.path.isfile('/TICI')
+Decider('MD5-timestamp')
 
 AddOption('--test',
           action='store_true',