diff --git a/c/COMSOL/COMSOL-5.2.0-COM.eb b/c/COMSOL/COMSOL-5.2.0-COM.eb
index 18be0061..9a02a2ab 100644
--- a/c/COMSOL/COMSOL-5.2.0-COM.eb
+++ b/c/COMSOL/COMSOL-5.2.0-COM.eb
@@ -20,12 +20,12 @@ toolchain = SYSTEM
 # tar zcf /apps/easybuild/sources/c/COMSOL/COMSOL-5.2.0.tar.gz .
 # umount /mnt
 sources = [SOURCE_TAR_GZ]
-checksums = [None]
+checksums = ['a789d49fe9e964b211dd1253e96c8d8fd0fa67d51fcd1dac3ff169de34188ef4']
 
 # license is required, can be specified via $LMCOMSOL_LICENSE_FILE
 license_file = '/apps/licenses/COMSOL/52/License__com.dat'
 modextravars = {
-    '$LMCOMSOL_LICENSE_FILE': '/apps/licenses/COMSOL/52/License__edu.dat',
+    'LMCOMSOL_LICENSE_FILE': '/apps/licenses/COMSOL/52/License__edu.dat',
 }
 
 moduleclass = 'phys'