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diff --git a/web/core/modules/taxonomy/migration_templates/d6_vocabulary_field_instance.yml b/web/core/modules/taxonomy/migration_templates/d6_vocabulary_field_instance.yml
index 6fe5eed01..7e2837786 100644
--- a/web/core/modules/taxonomy/migration_templates/d6_vocabulary_field_instance.yml
+++ b/web/core/modules/taxonomy/migration_templates/d6_vocabulary_field_instance.yml
@@ -8,6 +8,7 @@ source:
     entity_type: node
     auto_create: true
     selection_handler: 'default:taxonomy_term'
+    field_prefix: field_
 process:
   entity_type: 'constants/entity_type'
   bundle:
@@ -18,7 +19,8 @@ process:
     -
       plugin: skip_on_empty
       method: row
-  field_name:
+  # This value is only used in the 'field_name' process pipeline below.
+  raw_field_name:
     -
       plugin: migration_lookup
       migration: d6_taxonomy_vocabulary
@@ -26,6 +28,23 @@ process:
     -
       plugin: skip_on_empty
       method: row
+  field_name:
+    # Prepend field_ to avoid conflicts with base fields, and make sure the
+    # result is no longer than 32 characters.
+    -
+      plugin: concat
+      source:
+        - constants/field_prefix
+        - '@raw_field_name'
+    -
+      plugin: substr
+      length: 32
+    -
+      # This plugin checks if the vocabulary being migrated is the one used by
+      # Forum. If so, we use the machine name that Forum expects. Otherwise, we
+      # leave it unchanged.
+      plugin: forum_vocabulary
+      machine_name: taxonomy_forums
   label: name
   'settings/handler': 'constants/selection_handler'
   'settings/handler_settings/target_bundles/0': '@field_name'