diff --git a/pgproto3/backend.go b/pgproto3/backend.go
index 8f3c3478..ea44d1d1 100644
--- a/pgproto3/backend.go
+++ b/pgproto3/backend.go
@@ -15,6 +15,7 @@ type Backend struct {
 	// Frontend message flyweights
 	bind            Bind
 	_close          Close
+	copyFail        CopyFail
 	describe        Describe
 	execute         Execute
 	flush           Flush
@@ -82,6 +83,8 @@ func (b *Backend) Receive() (FrontendMessage, error) {
 		msg = &b.describe
 	case 'E':
 		msg = &b.execute
+	case 'f':
+		msg = &b.copyFail
 	case 'H':
 		msg = &b.flush
 	case 'P':
diff --git a/pgproto3/frontend.go b/pgproto3/frontend.go
index d1541c74..31a955bc 100644
--- a/pgproto3/frontend.go
+++ b/pgproto3/frontend.go
@@ -23,6 +23,7 @@ type Frontend struct {
 	copyInResponse       CopyInResponse
 	copyOutResponse      CopyOutResponse
 	copyDone             CopyDone
+	copyFail             CopyFail
 	dataRow              DataRow
 	emptyQueryResponse   EmptyQueryResponse
 	errorResponse        ErrorResponse
@@ -83,6 +84,8 @@ func (b *Frontend) Receive() (BackendMessage, error) {
 		msg = &b.dataRow
 	case 'E':
 		msg = &b.errorResponse
+	case 'f':
+		msg = &b.copyFail
 	case 'G':
 		msg = &b.copyInResponse
 	case 'H':