diff --git a/web/send_error.go b/web/send_error.go
index 71c1971ea..72a605438 100644
--- a/web/send_error.go
+++ b/web/send_error.go
@@ -61,7 +61,7 @@ func SendError(
 	// sub-problems
 	prob.Type = probs.ProblemType(namespace) + prob.Type
 	for i := range prob.SubProblems {
-		prob.SubProblems[i].Type = probs.ProblemType(namespace) + prob.Type
+		prob.SubProblems[i].Type = prob.Type
 	}
 	problemDoc, err := json.MarshalIndent(prob, "", "  ")
 	if err != nil {
diff --git a/web/send_error_test.go b/web/send_error_test.go
index 31eee128b..89258a086 100644
--- a/web/send_error_test.go
+++ b/web/send_error_test.go
@@ -44,7 +44,7 @@ func TestSendErrorSubProblemNamespace(t *testing.T) {
 		"status": 400,
 		"subproblems": [
 		  {
-			"type": "namespace:test:namespace:test:malformed",
+			"type": "namespace:test:malformed",
 			"detail": "dfoop :: nop",
 			"status": 400,
 			"identifier": {
@@ -53,7 +53,7 @@ func TestSendErrorSubProblemNamespace(t *testing.T) {
 			}
 		  },
 		  {
-			"type": "namespace:test:namespace:test:malformed",
+			"type": "namespace:test:malformed",
 			"detail": "dfoop :: nah",
 			"status": 400,
 			"identifier": {