diff --git a/libnm-core/tests/test-general.c b/libnm-core/tests/test-general.c
index 42b55c187f..53d8195c11 100644
--- a/libnm-core/tests/test-general.c
+++ b/libnm-core/tests/test-general.c
@@ -4284,7 +4284,7 @@ again:
 			 * by randomly setting bits. */
 			numbits = g_rand_int_range (rand, 1, 65);
 			while (xno != ~((guint64) 0) && numbits > 0) {
-				guint64 v = (1LL << g_rand_int_range (rand, 0, 65));
+				guint64 v = (1LL << g_rand_int_range (rand, 0, 64));
 
 				if ((xno | v) != xno) {
 					xno |= v;