diff --git a/src/thd_engine_adaptive.cpp b/src/thd_engine_adaptive.cpp
index 1464006..c0ab87e 100644
--- a/src/thd_engine_adaptive.cpp
+++ b/src/thd_engine_adaptive.cpp
@@ -1190,9 +1190,9 @@ int cthd_engine_adaptive::install_passive(struct psv *psv) {
 	int target_state = 0;
 
 	if (psv->limit.length()) {
-		if (psv->limit == "MAX") {
+		if (psv->limit == "MAX" || psv->limit == "max" ) {
 			target_state = TRIP_PT_INVALID_TARGET_STATE;
-		} else if (psv->limit == "MIN") {
+		} else if (psv->limit == "MIN" || psv->limit == "min") {
 			target_state = 0;
 		} else {
 			std::istringstream buffer(psv->limit);