diff --git a/config/initializers/0_application_config.rb b/config/initializers/0_application_config.rb
index d7e5d698e..aa59c61f5 100644
--- a/config/initializers/0_application_config.rb
+++ b/config/initializers/0_application_config.rb
@@ -5,7 +5,7 @@ class ApplicationConfig
     if ENV.key?(key)
       ENV[key]
     else
-      Rails.logger.warn("Unset ENV variable: #{key}.")
+      Rails.logger.debug("Unset ENV variable: #{key}.")
       nil
     end
   end
diff --git a/spec/initializers/application_config_spec.rb b/spec/initializers/application_config_spec.rb
index 3c216b61c..495559697 100644
--- a/spec/initializers/application_config_spec.rb
+++ b/spec/initializers/application_config_spec.rb
@@ -2,9 +2,9 @@ require "rails_helper"
 
 describe ApplicationConfig do
   it "logs warning if key is not found" do
-    allow(Rails.logger).to receive(:warn)
+    allow(Rails.logger).to receive(:debug)
     described_class["missing"]
-    expect(Rails.logger).to have_received(:warn).with("Unset ENV variable: missing.")
+    expect(Rails.logger).to have_received(:debug).with("Unset ENV variable: missing.")
   end
 
   describe ".app_domain_no_port" do