diff --git a/files/squid/helpers/rules.d/opendsa.rules b/files/squid/helpers/rules.d/opendsa.rules
index 3c85a0238c42860e861576812b57ad007e07a9e4..e510d496462cf9e9d8698a74498c89f037d11185 100644
--- a/files/squid/helpers/rules.d/opendsa.rules
+++ b/files/squid/helpers/rules.d/opendsa.rules
@@ -1,5 +1,7 @@
 // OpenDSA
 
+^.* false
+
 ^https?://www\.ida\.liu\.se/edu/ugrad/datortenta/OpenDSA/Books/.*                false
 ^https?://www\.ida\.liu\.se/edu/ugrad/datortenta/OpenDSA/lib/.*                  true
 ^https?://www\.ida\.liu\.se/edu/ugrad/datortenta/OpenDSA/JSAV/.*                 true