1 files changed, 2 insertions, 2 deletions

diff --git a/cpp/nissy.h b/cpp/nissy.h
index db8ba5f..4b9c1c9 100644
--- a/cpp/nissy.h
+++ b/cpp/nissy.h
@@ -91,8 +91,8 @@ namespace nissy {
                 error check_data();
                 void unload_data();
                 solve_result solve(const cube&, nissflag, unsigned minmoves,
-                    unsigned maxmoves, unsigned maxsols, int optimal,
-                    int threads);
+                    unsigned maxmoves, unsigned maxsols, unsigned optimal,
+                    unsigned threads);
 
                 static std::variant<solver, error> get(const std::string&);
         private: