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diff --git a/runtime/zlibw.h b/runtime/zlibw.h
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+/* The zlibw object. It encapsulates the zlib functionality. The primary
+ * purpose of this wrapper class is to enable rsyslogd core to be build without
+ * zlib libraries.
+ *
+ * Copyright 2009-2022 Adiscon GmbH.
+ *
+ * This file is part of the rsyslog runtime library.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *       -or-
+ *       see COPYING.ASL20 in the source distribution
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef INCLUDED_ZLIBW_H
+#define INCLUDED_ZLIBW_H
+
+#include <zlib.h>
+
+#include "errmsg.h"
+
+/* interfaces */
+BEGINinterface(zlibw) /* name must also be changed in ENDinterface macro! */
+	int (*DeflateInit)(z_streamp strm, int);
+	int (*DeflateInit2)(z_streamp strm, int level, int method, int windowBits, int memLevel, int strategy);
+	int (*Deflate)(z_streamp strm, int);
+	int (*DeflateEnd)(z_streamp strm);
+	rsRetVal (*doStrmWrite)(strm_t *pThis, uchar *const pBuf, const size_t lenBuf, const int bFlush,
+		rsRetVal (*strmPhysWrite)(strm_t *pThis, uchar *pBuf, size_t lenBuf) );
+	rsRetVal (*doCompressFinish)(strm_t *pThis,
+		rsRetVal (*Destruct)(strm_t *pThis, uchar *pBuf, size_t lenBuf) );
+	rsRetVal (*Destruct)(strm_t *pThis);
+ENDinterface(zlibw)
+#define zlibwCURR_IF_VERSION 2 /* increment whenever you change the interface structure! */
+
+
+/* prototypes */
+PROTOTYPEObj(zlibw);
+
+/* the name of our library binary */
+#define LM_ZLIBW_FILENAME "lmzlibw"
+
+#endif /* #ifndef INCLUDED_ZLIBW_H */