diff --git a/src/portmanager.cpp b/src/portmanager.cpp
index ff90d74..130b02d 100644
--- a/src/portmanager.cpp
+++ b/src/portmanager.cpp
@@ -291,6 +291,8 @@ static bool BaseSortPredicate(const Base *lhs, const Base *rhs)
 			}
 		} else {
 			// Alphabetic sort
+			if (ac >= 'a' && ac <= 'z') ac -= 'a' - 'A';
+			if (bc >= 'a' && bc <= 'z') bc -= 'a' - 'A';
 			if (ac != bc) {
 				return ac < bc;
 			}