diff --git a/test/behavior/int128.zig b/test/behavior/int128.zig
index 4b0232feb8c2b0186fe5e269890d4047aefc7c5c..18375a3e1745ece20c0f7e595442d6479aa6b1f5 100644
--- a/test/behavior/int128.zig
+++ b/test/behavior/int128.zig
@@ -32,6 +32,9 @@ test "int128" {
 
     buff = minInt(i128);
     try expect(buff < 0);
+
+    buff = -0x12341234123412341234123412341234;
+    try expect(-buff == 0x12341234123412341234123412341234);
 }
 
 test "truncate int128" {