diff --git a/eqpalg/test/test_algorithms.cc b/eqpalg/test/test_algorithms.cc
index b7cd01b..fa6ba78 100644
--- a/eqpalg/test/test_algorithms.cc
+++ b/eqpalg/test/test_algorithms.cc
@@ -342,11 +342,12 @@ TEST(bound_checker_setDetectMode_override) {
     bc.setLimits(-32768.0, 100.0);
     CHECK(bc.detectMode() == DetectMode::OnlyRight);
 
-    // manual override to Default
+    // manual override to Default, sentinel -32768 becomes real lower bound
     bc.setDetectMode(DetectMode::Default);
     CHECK(bc.detectMode() == DetectMode::Default);
-    // now both sides checked with sentinel values → out of lower triggers
-    CHECK_EQ(bc.isOutOfBounds(-999.0), true);
+    // -999 > -32768 → within bounds; 150 > 100 → out of upper
+    CHECK_EQ(bc.isOutOfBounds(-999.0), false);
+    CHECK_EQ(bc.isOutOfBounds(150.0), true);
 }
 
 // ============================================================================