diff --git a/io_scene_fbx/export_fbx_bin.py b/io_scene_fbx/export_fbx_bin.py
index 01713255b65126e94b6e523606f7c36f354a7ad0..4f50fa0b4cc1f7c72c79874a44f18628d6a6406a 100644
--- a/io_scene_fbx/export_fbx_bin.py
+++ b/io_scene_fbx/export_fbx_bin.py
@@ -2800,9 +2800,26 @@ def save(operator, context,
                 scene = bpy.data.scenes.new(name="FBX_Temp")
                 scene.layers = [True] * 20
                 # bpy.data.scenes.active = scene # XXX, cant switch
+                src_scenes = {}  # Count how much each 'source' scenes are used.
                 for ob_base in data.objects:
+                    for src_sce in ob_base.users_scene:
+                        if src_sce not in src_scenes:
+                            src_scenes[src_sce] = 0
+                        src_scenes[src_sce] += 1
                     scene.objects.link(ob_base)
 
+                # Find the 'most used' source scene, and use its unit settings. This is somewhat weak, but should work
+                # fine in most cases, and avoids stupid issues like T41931.
+                best_src_scene = None
+                best_src_scene_users = 0
+                for sce, nbr_users in src_scenes.items():
+                    if (nbr_users) > best_src_scene_users:
+                        best_src_scene_users = nbr_users
+                        best_src_scene = sce
+                scene.unit_settings.system = best_src_scene.unit_settings.system
+                scene.unit_settings.system_rotation = best_src_scene.unit_settings.system_rotation
+                scene.unit_settings.scale_length = best_src_scene.unit_settings.scale_length
+
                 scene.update()
                 # TODO - BUMMER! Armatures not in the group wont animate the mesh
             else:
diff --git a/io_scene_fbx_experimental/export_fbx_bin.py b/io_scene_fbx_experimental/export_fbx_bin.py
index f3a7dd5ff363642966581a8a162526cb2531d98e..5e59fabe7747ba506352cd2c1230c03867b3bd58 100644
--- a/io_scene_fbx_experimental/export_fbx_bin.py
+++ b/io_scene_fbx_experimental/export_fbx_bin.py
@@ -2926,9 +2926,26 @@ def save(operator, context,
                 scene = bpy.data.scenes.new(name="FBX_Temp")
                 scene.layers = [True] * 20
                 # bpy.data.scenes.active = scene # XXX, cant switch
+                src_scenes = {}  # Count how much each 'source' scenes are used.
                 for ob_base in data.objects:
+                    for src_sce in ob_base.users_scene:
+                        if src_sce not in src_scenes:
+                            src_scenes[src_sce] = 0
+                        src_scenes[src_sce] += 1
                     scene.objects.link(ob_base)
 
+                # Find the 'most used' source scene, and use its unit settings. This is somewhat weak, but should work
+                # fine in most cases, and avoids stupid issues like T41931.
+                best_src_scene = None
+                best_src_scene_users = 0
+                for sce, nbr_users in src_scenes.items():
+                    if (nbr_users) > best_src_scene_users:
+                        best_src_scene_users = nbr_users
+                        best_src_scene = sce
+                scene.unit_settings.system = best_src_scene.unit_settings.system
+                scene.unit_settings.system_rotation = best_src_scene.unit_settings.system_rotation
+                scene.unit_settings.scale_length = best_src_scene.unit_settings.scale_length
+
                 scene.update()
                 # TODO - BUMMER! Armatures not in the group wont animate the mesh
             else: