diff --git a/lib/lbfgs.c b/lib/lbfgs.c
index 6f5ee4d..c4f5930 100644
--- a/lib/lbfgs.c
+++ b/lib/lbfgs.c
@@ -112,7 +112,7 @@ typedef struct tag_iteration_data iteration_data_t;
 
 static const lbfgs_parameter_t _defparam = {
     6, 1e-5, 0, 1e-5,
-    0, LBFGS_LINESEARCH_DEFAULT, 20,
+    0, LBFGS_LINESEARCH_DEFAULT, 100,
     1e-20, 1e20, 1e-4, 0.9, 1.0e-16,
     0.0, 0, -1,
 };