diff --git a/app/controllers/admin/commercials_controller.rb b/app/controllers/admin/commercials_controller.rb
index 2a41b2dc..b5deddcb 100644
--- a/app/controllers/admin/commercials_controller.rb
+++ b/app/controllers/admin/commercials_controller.rb
@@ -22,7 +22,7 @@ module Admin
         redirect_to admin_conference_commercials_path,
                     notice: 'Commercial was successfully created.'
       else
-        flash[:alert] = "A error prohibited this Commercial from being saved: #{@commercial.errors.full_messages.join('. ')}."
+        flash[:alert] = "An error prohibited this Commercial from being saved: #{@commercial.errors.full_messages.join('. ')}."
         render :new
       end
     end
@@ -32,7 +32,7 @@ module Admin
         redirect_to admin_conference_commercials_path,
                     notice: 'Commercial was successfully updated.'
       else
-        flash[:alert] = "A error prohibited this Commercial from being saved: #{@commercial.errors.full_messages.join('. ')}."
+        flash[:alert] = "An error prohibited this Commercial from being saved: #{@commercial.errors.full_messages.join('. ')}."
         render :edit
       end
     end
diff --git a/app/controllers/commercials_controller.rb b/app/controllers/commercials_controller.rb
index 38bd2eb7..d107cb9c 100644
--- a/app/controllers/commercials_controller.rb
+++ b/app/controllers/commercials_controller.rb
@@ -18,7 +18,7 @@ class CommercialsController < ApplicationController
       redirect_to edit_conference_proposal_path(conference_id: @conference.short_title, id: @event.id),
                   notice: 'Commercial was successfully created.'
     else
-      flash[:alert] = "A error prohibited this Commercial from being saved: #{@commercial.errors.full_messages.join('. ')}."
+      flash[:alert] = "An error prohibited this Commercial from being saved: #{@commercial.errors.full_messages.join('. ')}."
       render :new
     end
   end
@@ -28,7 +28,7 @@ class CommercialsController < ApplicationController
       redirect_to edit_conference_proposal_path(conference_id: @conference.short_title, id: @event.id),
                   notice: 'Commercial was successfully updated.'
     else
-      flash[:alert] = "A error prohibited this Commercial from being saved: #{@commercial.errors.full_messages.join('. ')}."
+      flash[:alert] = "An error prohibited this Commercial from being saved: #{@commercial.errors.full_messages.join('. ')}."
       render :edit
     end
   end
diff --git a/spec/features/commercials_spec.rb b/spec/features/commercials_spec.rb
index 249bc28f..9c77b771 100644
--- a/spec/features/commercials_spec.rb
+++ b/spec/features/commercials_spec.rb
@@ -20,7 +20,7 @@ feature Commercial do
       select('SlideShare', from: 'commercial_commercial_type')
 
       click_button 'Create Commercial'
-      expect(flash).to eq("A error prohibited this Commercial from being saved: Commercial can't be blank.")
+      expect(flash).to eq("An error prohibited this Commercial from being saved: Commercial can't be blank.")
       expect(conference.commercials.count).to eq(expected_count - 1)
 
       # Create valid commercial
@@ -39,7 +39,7 @@ feature Commercial do
       fill_in 'commercial_commercial_id', with: ''
 
       click_button 'Update Commercial'
-      expect(flash).to eq("A error prohibited this Commercial from being saved: Commercial can't be blank.")
+      expect(flash).to eq("An error prohibited this Commercial from being saved: Commercial can't be blank.")
       expect(conference.commercials.count).to eq(expected_count)
 
       # Update valid commercial
@@ -97,7 +97,7 @@ feature Commercial do
       select('SlideShare', from: 'commercial_commercial_type')
 
       click_button 'Create Commercial'
-      expect(flash).to eq("A error prohibited this Commercial from being saved: Commercial can't be blank.")
+      expect(flash).to eq("An error prohibited this Commercial from being saved: Commercial can't be blank.")
       expect(event.commercials.count).to eq(@expected_count - 1)
     end
 
@@ -125,7 +125,7 @@ feature Commercial do
       select('SlideShare', from: 'commercial_commercial_type')
       fill_in 'commercial_commercial_id', with: ''
       click_button 'Update Commercial'
-      expect(flash).to eq("A error prohibited this Commercial from being saved: Commercial can't be blank.")
+      expect(flash).to eq("An error prohibited this Commercial from being saved: Commercial can't be blank.")
       expect(event.commercials.count).to eq(@expected_count)
     end