diff --git a/python/tvm/relax/frontend/tflite/tflite_flexbuffer.py b/python/tvm/relax/frontend/tflite/tflite_flexbuffer.py
index 148f404f25db..ce415fdece9c 100644
--- a/python/tvm/relax/frontend/tflite/tflite_flexbuffer.py
+++ b/python/tvm/relax/frontend/tflite/tflite_flexbuffer.py
@@ -135,10 +135,15 @@ def decode_map(self, end, byte_width, parent_byte_width):
         size_fmt = {1: "<b", 2: "<h", 4: "<i", 8: "<q"}[byte_width]
         map_size = struct.unpack(size_fmt, self.buffer[mid_loc - byte_width : mid_loc])[0]
 
-        # Find keys
+        # Find keys. The map header also stores the byte width of the keys vector, which is
+        # wider than one byte once a key string sits more than 255 bytes before it.
         keys_offset = mid_loc - byte_width * 3
         keys_end = self.indirect_jump(keys_offset, byte_width)
-        keys = self.decode_keys(keys_end, map_size, 1)
+        keys_byte_width_fmt = {1: "<B", 2: "<H", 4: "<I", 8: "<Q"}[byte_width]
+        keys_byte_width = struct.unpack(
+            keys_byte_width_fmt, self.buffer[mid_loc - byte_width * 2 : mid_loc - byte_width]
+        )[0]
+        keys = self.decode_keys(keys_end, map_size, keys_byte_width)
 
         # Find values
         values_end = self.indirect_jump(end, parent_byte_width)
diff --git a/tests/python/relax/test_frontend_tflite.py b/tests/python/relax/test_frontend_tflite.py
index 4799c3481cfd..db67e2c26b7b 100644
--- a/tests/python/relax/test_frontend_tflite.py
+++ b/tests/python/relax/test_frontend_tflite.py
@@ -3741,6 +3741,23 @@ def test_detection_postprocess_rejects_invalid_class_count():
         _build_detection_postprocess_mod(num_classes=2, input_num_classes=5)
 
 
+@pytest.mark.parametrize(
+    "custom_options",
+    [
+        pytest.param({f"option_{i}_" + "x" * 40: i for i in range(8)}, id="long_keys"),
+        pytest.param({f"key_{i:03d}": i for i in range(40)}, id="many_keys"),
+    ],
+)
+def test_flexbuffer_decoder_wide_key_vector(custom_options):
+    # Over 255 bytes of key strings make the keys vector use 2-byte offsets.
+    from flatbuffers import flexbuffers
+
+    from tvm.relax.frontend.tflite.tflite_flexbuffer import FlexBufferDecoder
+
+    flexbuffer = bytes(flexbuffers.Dumps(custom_options))
+    assert FlexBufferDecoder(flexbuffer).decode() == custom_options
+
+
 def _make_resize_expected(
     input_shape, output_size, method, coordinate_transformation_mode, rounding_method
 ):