diff --git a/test/behavior/int128.zig b/test/behavior/int128.zig
index 84c69ba499..4498752482 100644
--- a/test/behavior/int128.zig
+++ b/test/behavior/int128.zig
@@ -53,6 +53,11 @@ test "int128" {
 
     buff = -0x12341234123412341234123412341234;
     try expect(-buff == 0x12341234123412341234123412341234);
+
+    const a: i128 = -170141183460469231731687303715884105728;
+    const b: i128 = -0x8000_0000_0000_0000_0000_0000_0000_0000;
+    try expect(@divFloor(b, 1_000_000) == -170141183460469231731687303715885);
+    try expect(a == b);
 }
 
 test "truncate int128" {