diff --git a/src/smt/params/smt_params_helper.pyg b/src/smt/params/smt_params_helper.pyg
index 937aa6a2b..d6ca8c9b2 100644
--- a/src/smt/params/smt_params_helper.pyg
+++ b/src/smt/params/smt_params_helper.pyg
@@ -74,7 +74,7 @@ def_module_params(module_name='smt',
                           ('str.fast_length_tester_cache', BOOL, False, 'cache length tester constants instead of regenerating them'),
                           ('str.fast_value_tester_cache', BOOL, True, 'cache value tester constants instead of regenerating them'),
                           ('str.string_constant_cache', BOOL, True, 'cache all generated string constants generated from anywhere in theory_str'),
-                          ('str.use_binary_search', BOOL, True, 'use a binary search heuristic for finding concrete length values for free variables in theory_str (set to False to use linear search)'),
+                          ('str.use_binary_search', BOOL, False, 'use a binary search heuristic for finding concrete length values for free variables in theory_str (set to False to use linear search)'),
                           ('str.binary_search_start', UINT, 64, 'initial upper bound for theory_str binary search'),
                           ('theory_aware_branching', BOOL, False, 'Allow the context to use extra information from theory solvers regarding literal branching prioritization.'),
                           ('str.finite_overlap_models', BOOL, False, 'attempt a finite model search for overlapping variables instead of completely giving up on the arrangement'),