diff --git a/src/formula/formula.cpp b/src/formula/formula.cpp
index 5ca421dafb05..8b360b72dd6c 100644
--- a/src/formula/formula.cpp
+++ b/src/formula/formula.cpp
@@ -818,6 +818,7 @@ int operator_precedence(const token& t)
 		precedence_map[">"]     = n;
 		precedence_map["<="]    = n;
 		precedence_map[">="]    = n;
+		precedence_map["in"]    = n;
 		precedence_map["~"]     = ++n;
 		precedence_map["+"]     = ++n;
 		precedence_map["-"]     = n;