diff --git a/Exec/hydro_tests/oddeven/inputs.2d b/Exec/hydro_tests/oddeven/inputs.2d
index 163f9461f6..3ed51b3f92 100644
--- a/Exec/hydro_tests/oddeven/inputs.2d
+++ b/Exec/hydro_tests/oddeven/inputs.2d
@@ -22,6 +22,7 @@ castro.do_hydro = 1
 castro.do_react = 0
 castro.ppm_type = 0
 castro.hybrid_riemann = 1
+castro.shock_detection_threshold = 0.5
 
 # TIME STEP CONTROL