diff --git a/src/BOOLEAN.h b/src/BOOLEAN.h
new file mode 100644
index 0000000..217d0f1
--- /dev/null
+++ b/src/BOOLEAN.h
@@ -0,0 +1,36 @@
+/*-
+ * Copyright (c) 2003 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef	_BOOLEAN_H_
+#define	_BOOLEAN_H_
+
+#include <asn_application.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * The underlying integer may contain various values, but everything
+ * non-zero is capped to 0xff by the DER encoder. The BER decoder may
+ * yield non-zero values different from 1, beware.
+ */
+typedef int BOOLEAN_t;
+
+extern asn_TYPE_descriptor_t asn_DEF_BOOLEAN;
+
+asn_struct_free_f BOOLEAN_free;
+asn_struct_print_f BOOLEAN_print;
+ber_type_decoder_f BOOLEAN_decode_ber;
+der_type_encoder_f BOOLEAN_encode_der;
+xer_type_decoder_f BOOLEAN_decode_xer;
+xer_type_encoder_f BOOLEAN_encode_xer;
+per_type_decoder_f BOOLEAN_decode_uper;
+per_type_encoder_f BOOLEAN_encode_uper;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _BOOLEAN_H_ */