diff --git a/src/cmd_context/cmd_context.cpp b/src/cmd_context/cmd_context.cpp
index 260d49174..3f34f3128 100644
--- a/src/cmd_context/cmd_context.cpp
+++ b/src/cmd_context/cmd_context.cpp
@@ -1763,7 +1763,7 @@ void cmd_context::validate_model() {
                     continue;
                 }
                 try {
-                    for_each_expr(contains_underspecified, r);
+                    for_each_expr(contains_underspecified, a);
                 }
                 catch (contains_underspecified_op_proc::found) {
                     continue;