diff --git a/plugin/sysest.c b/plugin/sysest.c
index 7bc779ec0..2b70289a3 100644
--- a/plugin/sysest.c
+++ b/plugin/sysest.c
@@ -718,7 +718,7 @@ augment_y_with_restrictions (gretl_matrix *y, int mk, int nr,
     return 0;
 }
 
-#define SYS_MAX_ITER 100
+#define SYS_MAX_ITER 250
 #define SYS_LL_TOL 1.0e-12
 #define SYS_BDIFF_TOL 1.0e-9