diff --git a/io_scene_fbx/__init__.py b/io_scene_fbx/__init__.py
index 9611cb1f2600fa3c84c2dde7747b8a22a4f7d468..920ddc4ca1f337ce0542006bb744bca4090d39ab 100644
--- a/io_scene_fbx/__init__.py
+++ b/io_scene_fbx/__init__.py
@@ -21,7 +21,7 @@
 bl_info = {
     "name": "FBX format",
     "author": "Campbell Barton, Bastien Montagne, Jens Restemeier",
-    "version": (3, 9, 1),
+    "version": (3, 9, 2),
     "blender": (2, 79, 1),
     "location": "File > Import-Export",
     "description": "FBX IO meshes, UV's, vertex colors, materials, textures, cameras, lamps and actions",
diff --git a/io_scene_fbx/export_fbx_bin.py b/io_scene_fbx/export_fbx_bin.py
index b75a8977cb759357798a6947b6e4a325963956fc..2df62e3ffae0404fbe12af313e86ca09ba106d83 100644
--- a/io_scene_fbx/export_fbx_bin.py
+++ b/io_scene_fbx/export_fbx_bin.py
@@ -1023,9 +1023,11 @@ def fbx_data_mesh_elements(root, me_obj, scene_data, done_meshes):
             if tspacenumber:
                 t_ln = array.array(data_types.ARRAY_FLOAT64, (0.0,)) * len(me.loops) * 3
                 # t_lnw = array.array(data_types.ARRAY_FLOAT64, (0.0,)) * len(me.loops)
+                uv_names = [uvlayer.name for uvlayer in me.uv_layers]
+                for name in uv_names:
+                    me.calc_tangents(name)
                 for idx, uvlayer in enumerate(me.uv_layers):
                     name = uvlayer.name
-                    me.calc_tangents(name)
                     # Loop bitangents (aka binormals).
                     # NOTE: this is not supported by importer currently.
                     me.loops.foreach_get("bitangent", t_ln)