diff --git a/installer/templates/phx_single/config/dev.exs b/installer/templates/phx_single/config/dev.exs
index cb49f2cd4b..1f1b3844b4 100644
--- a/installer/templates/phx_single/config/dev.exs
+++ b/installer/templates/phx_single/config/dev.exs
@@ -63,10 +63,10 @@ config :logger, :console, format: "[$level] $message\n"
 config :phoenix, :stacktrace_depth, 20
 
 # Initialize plugs at runtime for faster development compilation
-config :phoenix, :plug_init_mode, :runtime<%= if @mailer do %>
+config :phoenix, :plug_init_mode, :runtime<%= if @html do %>
 
 # Include HEEx debug annotations as HTML comments in rendered markup
-config :phoenix_live_view, :debug_heex_annotations, true
+config :phoenix_live_view, :debug_heex_annotations, true<% end %><%= if @mailer do %>
 
 # Disable swoosh api client as it is only required for production adapters.
 config :swoosh, :api_client, false<% end %>
diff --git a/installer/templates/phx_umbrella/config/dev.exs b/installer/templates/phx_umbrella/config/dev.exs
index a7b5d136ee..c8c6d4b5dc 100644
--- a/installer/templates/phx_umbrella/config/dev.exs
+++ b/installer/templates/phx_umbrella/config/dev.exs
@@ -4,10 +4,10 @@ import Config
 config :logger, :console, format: "[$level] $message\n"
 
 # Initialize plugs at runtime for faster development compilation
-config :phoenix, :plug_init_mode, :runtime<%= if @mailer do %>
+config :phoenix, :plug_init_mode, :runtime<%= if @html do %>
 
 # Include HEEx debug annotations as HTML comments in rendered markup
-config :phoenix_live_view, :debug_heex_annotations, true
+config :phoenix_live_view, :debug_heex_annotations, true<% end %><%= if @mailer do %>
 
 # Disable swoosh api client as it is only required for production adapters.
 config :swoosh, :api_client, false<% end %>