1 files changed, 1 insertions, 1 deletions

diff --git a/subprojects/frontend/src/language/problem.grammar b/subprojects/frontend/src/language/problem.grammar
index eb3846cd..b8038b70 100644
--- a/subprojects/frontend/src/language/problem.grammar
+++ b/subprojects/frontend/src/language/problem.grammar
@@ -130,7 +130,7 @@ UnaryExpr {
   !prefix
   (
     "+" | "-" | "!" | kw<"count"> |
-    kw<"candidate"> | kw<"may"> | kw<"must">
+    kw<"candidate"> kw<"partial"> | kw<"may"> | kw<"must">
   )
   Expr
 }