diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index fc35352..ea68e0c 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,10 @@ Changelog
 
   Thanks to Zoe Guillen for the report in `PR #496 <https://github.com/adamchainz/apig-wsgi/pull/496>`__.
 
+* Treat the content-type header "application/problem+json" as non binary by default.
+
+  Thanks to Ido Savion in `PR #503 <https://github.com/adamchainz/apig-wsgi/pull/503>`__.
+
 * Support Python 3.13.
 
 * Drop Python 3.8 support.
diff --git a/src/apig_wsgi/__init__.py b/src/apig_wsgi/__init__.py
index bb8fbdc..e786628 100644
--- a/src/apig_wsgi/__init__.py
+++ b/src/apig_wsgi/__init__.py
@@ -21,6 +21,11 @@
 DEFAULT_NON_BINARY_CONTENT_TYPE_PREFIXES: tuple[str, ...] = (
     "text/",
     "application/json",
+    # application/problem+json - a draft standard for JSON error responses
+    # https://datatracker.ietf.org/doc/html/draft-ietf-appsawg-http-problem-00#section-3
+    "application/problem+json",
+    # application/vnd.api+json - JSON:API specification
+    # https://jsonapi.org/
     "application/vnd.api+json",
 )
 
@@ -50,7 +55,7 @@ def make_lambda_handler(
         Whether to support returning APIG-compatible binary responses
     non_binary_content_type_prefixes : tuple of str
         Tuple of content type prefixes which should be considered "Non-Binary" when
-        `binray_support` is True. This prevents apig_wsgi from unexpectedly encoding
+        `binary_support` is True. This prevents apig_wsgi from unexpectedly encoding
         non-binary responses as binary.
     """
     if non_binary_content_type_prefixes is None:
diff --git a/tests/test_apig_wsgi.py b/tests/test_apig_wsgi.py
index c906007..a2ec224 100644
--- a/tests/test_apig_wsgi.py
+++ b/tests/test_apig_wsgi.py
@@ -54,7 +54,13 @@ def simple_app() -> Generator[App]:
 
 parametrize_default_text_content_type = pytest.mark.parametrize(
     "text_content_type",
-    ["text/plain", "text/html", "application/json", "application/vnd.api+json"],
+    [
+        "text/plain",
+        "text/html",
+        "application/json",
+        "application/problem+json",
+        "application/vnd.api+json",
+    ],
 )