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-rw-r--r--src/libutil/args.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libutil/args.hh b/src/libutil/args.hh
index 401bebbabc08..37e31825ab37 100644
--- a/src/libutil/args.hh
+++ b/src/libutil/args.hh
@@ -90,7 +90,7 @@ public:
 
         template<class T>
         FlagMaker & set(T * dest, const T & val) {
-            flag->arity = 1;
+            flag->arity = 0;
             flag->handler = [=](Strings ss) { *dest = val; };
             return *this;
         };