diff --git a/lib/tasks/client_prefix.rake b/lib/tasks/client_prefix.rake
index 679b6a185..e17bbd26c 100644
--- a/lib/tasks/client_prefix.rake
+++ b/lib/tasks/client_prefix.rake
@@ -48,7 +48,7 @@ namespace :client_prefix do
 
   desc 'Import all client_prefixes'
   task :import => :environment do
-    ClientPrefix.import(index: ClientPrefix.inactive_index)
+    ClientPrefix.import(index: ENV["INDEX"] || ClientPrefix.inactive_index, batch_size: (ENV["BATCH_SIZE"] || 100).to_i)
   end
 
   desc 'Generate uid'
diff --git a/lib/tasks/prefix.rake b/lib/tasks/prefix.rake
index 855173efa..060b6aa95 100644
--- a/lib/tasks/prefix.rake
+++ b/lib/tasks/prefix.rake
@@ -48,7 +48,7 @@ namespace :prefix do
 
   desc 'Import all prefixes'
   task :import => :environment do
-    Prefix.import(index: Prefix.inactive_index)
+    Prefix.import(index: ENV["INDEX"] || Prefix.inactive_index, batch_size: (ENV["BATCH_SIZE"] || 100).to_i)
   end
 
   desc 'Delete prefix and associated DOIs'
diff --git a/lib/tasks/provider_prefix.rake b/lib/tasks/provider_prefix.rake
index d04028c07..14bfcadf8 100644
--- a/lib/tasks/provider_prefix.rake
+++ b/lib/tasks/provider_prefix.rake
@@ -48,7 +48,7 @@ namespace :provider_prefix do
 
   desc 'Import all provider_prefixes'
   task :import => :environment do
-    ProviderPrefix.import(index: ProviderPrefix.inactive_index)
+    ProviderPrefix.import(index: ENV["INDEX"] || ProviderPrefix.inactive_index, batch_size: (ENV["BATCH_SIZE"] || 100).to_i)
   end
 
   desc 'Generate uid'