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-rw-r--r--src/libexpr/parser.y1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index 3540058bc1e0..1c06240fdab0 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -249,6 +249,7 @@ expr_list
 formals
   : formal ',' formals { $$ = ATinsert($3, $1); } /* idem - right recursive */
   | formal { $$ = ATinsert(ATempty, $1); }
+  | { $$ = ATempty; }
   ;
 
 formal