diff --git a/src/editor/Editor.tsx b/src/editor/Editor.tsx
index 8280818e..630c6195 100644
--- a/src/editor/Editor.tsx
+++ b/src/editor/Editor.tsx
@@ -444,7 +444,7 @@ const Editor: React.VFC = () => {
 
                 // istanbul ignore if: should not be reachable
                 if (!(firstItem instanceof HTMLElement)) {
-                    console.log(`bug: firstItem is not an HTMLElement: ${firstItem}`);
+                    console.error(`bug: firstItem is not an HTMLElement: ${firstItem}`);
                     return;
                 }
 
diff --git a/src/firmware/sagas.ts b/src/firmware/sagas.ts
index 214bfb4f..8e3669fb 100644
--- a/src/firmware/sagas.ts
+++ b/src/firmware/sagas.ts
@@ -751,7 +751,7 @@ function* handleFlashUsbDfu(action: ReturnType<typeof firmwareFlashUsbDfu>): Gen
                 }
 
                 // not expected
-                console.log(err);
+                console.error(err);
             }),
         );