diff --git a/packages/api-format/src/format.spec.js b/packages/api-format/src/format.spec.js
index 8205c5809c..8d1d0fe75e 100644
--- a/packages/api-format/src/format.spec.js
+++ b/packages/api-format/src/format.spec.js
@@ -12,7 +12,7 @@ describe('format', () => {
 
   beforeEach(() => {
     echoSpy = jest.fn(echo);
-    warnSpy = jest.spyOn(console, 'warn');
+    warnSpy = jest.spyOn(console, 'log');
 
     formatters = new Map([
       ['Address', echoSpy],
diff --git a/packages/api-format/src/format.ts b/packages/api-format/src/format.ts
index a03e606dc8..f45198d8d9 100644
--- a/packages/api-format/src/format.ts
+++ b/packages/api-format/src/format.ts
@@ -28,7 +28,7 @@ function formatSingleType (formatters: FormattersFunctionMap, type: Param$Types,
   const formatter = formatters.get(type);
 
   if (isUndefined(formatter)) {
-    l.warn(`Unable to find default formatter for '${typeToString(type)}', falling back to echo`);
+    l.debug(() => `Unable to find default formatter for '${typeToString(type)}', falling back to echo`);
 
     return echo(value);
   }