diff --git a/include/ircd/db/database/comparator.h b/include/ircd/db/database/comparator.h
index 7801da5cd..731c52fed 100644
--- a/include/ircd/db/database/comparator.h
+++ b/include/ircd/db/database/comparator.h
@@ -29,8 +29,5 @@ struct ircd::db::database::comparator final
 	bool Equal(const Slice &a, const Slice &b) const noexcept override;
 	const char *Name() const noexcept override;
 
-	comparator(database *const &d, db::comparator user)
-	:d{d}
-	,user{std::move(user)}
-	{}
+	comparator(database *const &d, db::comparator user);
 };
diff --git a/ircd/db.cc b/ircd/db.cc
index 8e03c6ef4..cd1e848cc 100644
--- a/ircd/db.cc
+++ b/ircd/db.cc
@@ -1259,6 +1259,16 @@ catch(const std::out_of_range &e)
 // database::comparator
 //
 
+ircd::db::database::comparator::comparator(database *const &d,
+                                           db::comparator user)
+:d{d}
+,user
+{
+	std::move(user)
+}
+{
+}
+
 const char *
 ircd::db::database::comparator::Name()
 const noexcept