--- a/metric-providers/org.ossmeter.metricprovider.trans.rascal.churnpercommitter/src/CommitterChurn.rsc
+++ b/metric-providers/org.ossmeter.metricprovider.trans.rascal.churnpercommitter/src/CommitterChurn.rsc
@@ -6,7 +6,8 @@
@metric{churnPerCommitter}
@doc{Count churn per committer}
@friendlyName{Counts number of lines added and deleted per committer}
-map[str author, int churn] churnPerCommitter(ProjectDelta delta, map[str, loc] workingCopyFolders, map[str, loc] scratchFolders)
+@appliesTo{generic()}
+map[str author, int churn] churnPerCommitter(ProjectDelta delta = \empty())
= (co.author : churn(co) | /VcsCommit co := delta)
;