diff --git a/app/controllers/administrateurs/attestation_templates_controller.rb b/app/controllers/administrateurs/attestation_templates_controller.rb
index 3308eb36d..27daeac21 100644
--- a/app/controllers/administrateurs/attestation_templates_controller.rb
+++ b/app/controllers/administrateurs/attestation_templates_controller.rb
@@ -1,5 +1,7 @@
 module Administrateurs
   class AttestationTemplatesController < AdministrateurController
+    include UninterlacePngConcern
+
     before_action :retrieve_procedure
 
     def show
@@ -63,23 +65,14 @@ module Administrateurs
         signature_file = params['attestation_template'].delete('signature')
 
         if logo_file.present?
-          @activated_attestation_params[:logo] = uninterlaced_png(logo_file)
+          @activated_attestation_params[:logo] = uninterlace_png(logo_file)
         end
         if signature_file.present?
-          @activated_attestation_params[:signature] = uninterlaced_png(signature_file)
+          @activated_attestation_params[:signature] = uninterlace_png(signature_file)
         end
       end
 
       @activated_attestation_params
     end
-
-    def uninterlaced_png(uploaded_file)
-      if uploaded_file&.content_type == 'image/png'
-        chunky_img = ChunkyPNG::Image.from_io(uploaded_file.to_io)
-        chunky_img.save(uploaded_file.tempfile.to_path, interlace: false)
-        uploaded_file.tempfile.reopen(uploaded_file.tempfile.to_path, 'rb')
-      end
-      uploaded_file
-    end
   end
 end
diff --git a/app/controllers/concerns/uninterlace_png_concern.rb b/app/controllers/concerns/uninterlace_png_concern.rb
new file mode 100644
index 000000000..c56c91725
--- /dev/null
+++ b/app/controllers/concerns/uninterlace_png_concern.rb
@@ -0,0 +1,14 @@
+module UninterlacePngConcern
+  extend ActiveSupport::Concern
+
+  private
+
+  def uninterlace_png(uploaded_file)
+    if uploaded_file&.content_type == 'image/png'
+      chunky_img = ChunkyPNG::Image.from_io(uploaded_file.to_io)
+      chunky_img.save(uploaded_file.tempfile.to_path, interlace: false)
+      uploaded_file.tempfile.reopen(uploaded_file.tempfile.to_path, 'rb')
+    end
+    uploaded_file
+  end
+end