diff --git a/howso/marginal.amlg b/howso/marginal.amlg
index aa11909bf..336d7ca15 100644
--- a/howso/marginal.amlg
+++ b/howso/marginal.amlg
@@ -631,7 +631,7 @@
 								(call !GetCasesByCondition (assoc
 									condition condition
 									num_cases num_cases
-									prevision precision
+									precision precision
 								))
 						)