diff --git a/lib/bulletmark_repairer/controller_corrector.rb b/lib/bulletmark_repairer/controller_corrector.rb
index 1bba8d8..91c39e4 100644
--- a/lib/bulletmark_repairer/controller_corrector.rb
+++ b/lib/bulletmark_repairer/controller_corrector.rb
@@ -46,10 +46,12 @@ def insert_includes(node:)
     return unless node.respond_to?(:to_sexp_array)
 
     type, identifier = node.to_sexp_array.take(2)
-
     if type == :ivasgn && identifier == instance_variable_name
-      insert_after node.children.last.location.expression, ".includes(#{associations})"
-      @patched = true
+      inserted = ".includes(#{associations})"
+      unless node.location.expression.source.include?(inserted)
+        insert_after node.children.last.location.expression, inserted
+        @patched = true
+      end
     else
       node
         .children
diff --git a/lib/bulletmark_repairer/corrector.rb b/lib/bulletmark_repairer/corrector.rb
index 8c2db74..5da8f17 100644
--- a/lib/bulletmark_repairer/corrector.rb
+++ b/lib/bulletmark_repairer/corrector.rb
@@ -26,8 +26,11 @@ def insert_includes(node:)
 
     # TODO: Patch Enumerable methods other than each and map
     if node.children.last.in?(%i[each map])
-      insert_after node.children[0].location.expression, ".includes(#{associations})"
-      @patched = true
+      inserted = ".includes(#{associations})"
+      unless node.location.expression.source.include?(inserted)
+        insert_after node.children[0].location.expression, ".includes(#{associations})"
+        @patched = true
+      end
     else
       node.children.each { |child_node| insert_includes(node: child_node) }
     end
@@ -39,8 +42,11 @@ def insert_includes_for_vasgn(node:, type:)
     return unless node.location.expression.line <= line_no && line_no <= node.location.expression.last_line
 
     if node.type == type
-      insert_after node.children.last.location.expression, ".includes(#{associations})"
-      @patched = true
+      inserted = ".includes(#{associations})"
+      unless node.location.expression.source.include?(inserted)
+        insert_after node.children.last.location.expression, ".includes(#{associations})"
+        @patched = true
+      end
     else
       node.children.each { |child_node| insert_includes_for_vasgn(node: child_node, type: type) }
     end