diff --git a/taskpolicy/taskpolicy.c b/taskpolicy/taskpolicy.c
index b031f944b2..4ad82018ed 100644
--- a/taskpolicy/taskpolicy.c
+++ b/taskpolicy/taskpolicy.c
@@ -126,7 +126,12 @@
 				flag_s = true;
 				break;
 			case 'S':
-				sec_transition_shims = parse_sec_transition_shims(optarg);
+				if (__builtin_available(macOS 15.2, *)) {
+					sec_transition_shims = parse_sec_transition_shims(optarg);
+				} else {
+					fprintf(stderr, "Running with security transition shims is only supported on macOS 15.2 and newer.\n");
+					exit(EX_USAGE);
+				}
 				break;
 			case '?':
 			default:
@@ -246,9 +251,11 @@
 		if (ret != 0) errc(EX_NOINPUT, ret, "posix_spawnattr_set_darwin_role_np");
 	}

-	if (sec_transition_shims) {
-		ret = posix_spawnattr_set_use_sec_transition_shims_np(&attr, sec_transition_shims);
-		if (ret != 0) errc(EX_NOINPUT, ret, "setting security transition shims");
+	if (__builtin_available(macOS 15.2, *)) {
+		if (sec_transition_shims) {
+			ret = posix_spawnattr_set_use_sec_transition_shims_np(&attr, sec_transition_shims);
+			if (ret != 0) errc(EX_NOINPUT, ret, "setting security transition shims");
+		}
 	}

 	ret = posix_spawnp(&pid, argv[0], NULL, &attr, argv, environ);