1 files changed, 1 insertions, 1 deletions
diff --git a/solver.h b/solver.h
index 357cd91..7fe71b2 100644
--- a/solver.h
+++ b/solver.h
@@ -6,6 +6,6 @@ typedef struct {
     unsigned len;
 } vect_t;
 
-void solve(vect_t *vect, int result);
+void solve(const vect_t *vect, int result);
 
 #endif /* SOLVER_H */