diff --git a/fakestorage/json_response.go b/fakestorage/json_response.go
index f16a7c5c10..99e8ce7d4c 100644
--- a/fakestorage/json_response.go
+++ b/fakestorage/json_response.go
@@ -32,7 +32,7 @@ func jsonToHTTPHandler(h jsonHandler) http.HandlerFunc {
 		status := resp.getStatus()
 		var data any
 		if status > 399 {
-			data = newErrorResponse(status, resp.getErrorMessage(status), nil)
+			data = newErrorResponse(status, resp.getErrorMessage(status), resp.getErrorList(status))
 		} else {
 			data = resp.data
 		}
@@ -59,6 +59,18 @@ func (r *jsonResponse) getErrorMessage(status int) string {
 	return http.StatusText(status)
 }
 
+func (r *jsonResponse) getErrorList(status int) []apiError {
+	if status == http.StatusOK {
+		return nil
+	} else {
+		return []apiError{{
+			Domain:  "global",
+			Reason:  http.StatusText(status),
+			Message: r.getErrorMessage(status),
+		}}
+	}
+}
+
 func errToJsonResponse(err error) jsonResponse {
 	status := 0
 	var pathError *os.PathError
diff --git a/fakestorage/object_test.go b/fakestorage/object_test.go
index b1581583ed..1c11a3190f 100644
--- a/fakestorage/object_test.go
+++ b/fakestorage/object_test.go
@@ -2028,7 +2028,7 @@ func TestServiceClientComposeObject(t *testing.T) {
 				"files/destination.txt",
 				[]string{"01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33"},
 				"",
-				"googleapi: Error 400: The number of source components provided (33) exceeds the maximum (32)",
+				"googleapi: Error 400: The number of source components provided (33) exceeds the maximum (32), Bad Request",
 			},
 		}
 		for _, test := range tests {
diff --git a/fakestorage/upload_test.go b/fakestorage/upload_test.go
index 79908fa42d..582c913e35 100644
--- a/fakestorage/upload_test.go
+++ b/fakestorage/upload_test.go
@@ -224,7 +224,7 @@ func TestServerClientObjectWriterWithDoesNotExistPrecondition(t *testing.T) {
 		if err == nil {
 			t.Fatal("expected overwriting existing object to fail, but received no error")
 		}
-		if err.Error() != "googleapi: Error 412: Precondition failed" {
+		if err.Error() != "googleapi: Error 412: Precondition failed, Precondition Failed" {
 			t.Errorf("expected HTTP 412 precondition failed error, but got %v", err)
 		}
 
@@ -346,7 +346,7 @@ func TestServerClientObjectOperationsWithIfGenerationNotMatchPrecondition(t *tes
 		if err == nil {
 			t.Fatal("expected overwriting existing object to fail, but received no error")
 		}
-		if err.Error() != "googleapi: Error 412: Precondition failed" {
+		if err.Error() != "googleapi: Error 412: Precondition failed, Precondition Failed" {
 			t.Errorf("expected HTTP 412 precondition failed error, but got %v", err)
 		}