diff --git a/db/migrate/20151028213830_add_unaccent_extension.rb b/db/migrate/20151028213830_add_unaccent_extension.rb
index f67f7d365..6c8a2d290 100644
--- a/db/migrate/20151028213830_add_unaccent_extension.rb
+++ b/db/migrate/20151028213830_add_unaccent_extension.rb
@@ -1,5 +1,5 @@
 class AddUnaccentExtension < ActiveRecord::Migration
   def change
-    execute "create extension unaccent"
+    execute "create extension unaccent if not exists unaccent"
   end
 end
diff --git a/db/migrate/20151028221647_add_pg_trgm_extension.rb b/db/migrate/20151028221647_add_pg_trgm_extension.rb
index f6fca0047..5b47c115e 100644
--- a/db/migrate/20151028221647_add_pg_trgm_extension.rb
+++ b/db/migrate/20151028221647_add_pg_trgm_extension.rb
@@ -1,5 +1,5 @@
 class AddPgTrgmExtension < ActiveRecord::Migration
   def change
-    execute "create extension pg_trgm"
+    execute "create extension pg_trgm if not exists pg_trgm"
   end
 end