diff --git a/lib/std/crypto/gimli.zig b/lib/std/crypto/gimli.zig
index 9b0f1d4f22..8d19683647 100644
--- a/lib/std/crypto/gimli.zig
+++ b/lib/std/crypto/gimli.zig
@@ -184,11 +184,31 @@ pub const State = struct {
 
 test "permute" {
     // test vector from gimli-20170627
+    const tv_input = [3][4]u32{
+        [4]u32{ 0x00000000, 0x9e3779ba, 0x3c6ef37a, 0xdaa66d46 },
+        [4]u32{ 0x78dde724, 0x1715611a, 0xb54cdb2e, 0x53845566 },
+        [4]u32{ 0xf1bbcfc8, 0x8ff34a5a, 0x2e2ac522, 0xcc624026 },
+    };
     var input: [48]u8 = undefined;
-    try std.fmt.hexToBytes(input[0..], "00000000ba79379e7af36e3c466da6da24e7dd781a6115172edb4cb566558453c8cfbbf15a4af38f22c52a2e264062cc");
+    var i: usize = 0;
+    while (i < 12) : (i += 1) {
+        mem.writeIntLittle(u32, input[i * 4 ..][0..4], tv_input[i / 4][i % 4]);
+    }
+
     var state = State.init(input);
     state.permute();
-    htest.assertEqual("5ac811ba19d1ba9180e80c38682c4cd2eaffce3e1c927a27bda0734fd89c5adaf073b684f72fe53449ef2b9ed6b81bf4", state.toSliceConst());
+
+    const tv_output = [3][4]u32{
+        [4]u32{ 0xba11c85a, 0x91bad119, 0x380ce880, 0xd24c2c68 },
+        [4]u32{ 0x3eceffea, 0x277a921c, 0x4f73a0bd, 0xda5a9cd8 },
+        [4]u32{ 0x84b673f0, 0x34e52ff7, 0x9e2bef49, 0xf41bb8d6 },
+    };
+    var expected_output: [48]u8 = undefined;
+    i = 0;
+    while (i < 12) : (i += 1) {
+        mem.writeIntLittle(u32, expected_output[i * 4 ..][0..4], tv_output[i / 4][i % 4]);
+    }
+    testing.expectEqualSlices(u8, state.toSliceConst(), expected_output[0..]);
 }
 
 pub const Hash = struct {