diff --git a/docs/types/scalars.md b/docs/types/scalars.md
index 9ce3e49e7e..b1d97f818d 100644
--- a/docs/types/scalars.md
+++ b/docs/types/scalars.md
@@ -113,7 +113,7 @@ import strawberry
 Base64 = strawberry.scalar(
     NewType("Base64", bytes),
     serialize=lambda v: base64.b64encode(v).decode("utf-8"),
-    parse_value=lambda v: base64.b64decode(v).encode("utf-8"),
+    parse_value=lambda v: base64.b64decode(v.encode("utf-8")),
 )