diff --git a/Makefile.am b/Makefile.am
index 4d81510..f371c7c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -39,6 +39,7 @@ include_HEADERS += \
 	lib/capnp_c.h
 
 noinst_HEADERS += \
+	lib/capnp_int.h \
 	compiler/str.h \
 	compiler/schema.capnp.h \
 	compiler/c++.capnp.h \
diff --git a/lib/capn-malloc.c b/lib/capn-malloc.c
index 6cfcea3..92714b9 100644
--- a/lib/capn-malloc.c
+++ b/lib/capn-malloc.c
@@ -9,6 +9,7 @@
  */
 
 #include "capnp_c.h"
+#include "capnp_priv.h"
 #include <stdlib.h>
 #include <string.h>
 #include <limits.h>
diff --git a/lib/capn-stream.c b/lib/capn-stream.c
index 658c08d..135d1b2 100644
--- a/lib/capn-stream.c
+++ b/lib/capn-stream.c
@@ -8,6 +8,7 @@
  */
 
 #include "capnp_c.h"
+#include "capnp_priv.h"
 #include <string.h>
 
 #ifndef min
diff --git a/lib/capnp_c.h b/lib/capnp_c.h
index 08d9e75..29bb9f7 100644
--- a/lib/capnp_c.h
+++ b/lib/capnp_c.h
@@ -273,40 +273,6 @@ int capn_write_mem(struct capn *c, uint8_t *p, size_t sz, int packed);
 void capn_free(struct capn *c);
 void capn_reset_copy(struct capn *c);
 
-/* capn_stream encapsulates the needed fields for capn_(deflate|inflate) in a
- * similar manner to z_stream from zlib
- *
- * The user should set next_in, avail_in, next_out, avail_out to the
- * available in/out buffers before calling capn_(deflate|inflate).
- *
- * Other fields should be zero initialized.
- */
-struct capn_stream {
-	const uint8_t *next_in;
-	size_t avail_in;
-	uint8_t *next_out;
-	size_t avail_out;
-	unsigned zeros, raw;
-
-	uint8_t inflate_buf[8];
-	size_t avail_buf;
-};
-
-#define CAPN_MISALIGNED -1
-#define CAPN_NEED_MORE -2
-
-/* capn_deflate deflates a stream to the packed format
- * capn_inflate inflates a stream from the packed format
- *
- * Returns:
- * CAPN_MISALIGNED - if the unpacked data is not 8 byte aligned
- * CAPN_NEED_MORE - more packed data/room is required (out for inflate, in for
- * deflate)
- * 0 - success, all output for inflate, all input for deflate processed
- */
-int capn_deflate(struct capn_stream*);
-int capn_inflate(struct capn_stream*);
-
 /* Inline functions */
 
 
diff --git a/lib/capnp_priv.h b/lib/capnp_priv.h
new file mode 100644
index 0000000..6c03763
--- /dev/null
+++ b/lib/capnp_priv.h
@@ -0,0 +1,62 @@
+/* vim: set sw=8 ts=8 sts=8 noet: */
+/* capnp_c.h
+ *
+ * Copyright (C) 2013 James McKaskill
+ * Copyright (C) 2014 Steve Dee
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+/*
+ * functions / structures in this header are private to the capnproto-c
+ * library;  applications should not call or use them.
+ */
+
+#ifndef CAPNP_PRIV_H
+#define CAPNP_PRIV_H
+
+#include "capnp_c.h"
+
+#if defined(__GNUC__) && __GNUC__ >= 4
+# define intern __attribute__((visibility ("internal")))
+#else
+# define intern /**/
+#endif
+
+/* capn_stream encapsulates the needed fields for capn_(deflate|inflate) in a
+ * similar manner to z_stream from zlib
+ *
+ * The user should set next_in, avail_in, next_out, avail_out to the
+ * available in/out buffers before calling capn_(deflate|inflate).
+ *
+ * Other fields should be zero initialized.
+ */
+struct capn_stream {
+	const uint8_t *next_in;
+	size_t avail_in;
+	uint8_t *next_out;
+	size_t avail_out;
+	unsigned zeros, raw;
+
+	uint8_t inflate_buf[8];
+	size_t avail_buf;
+};
+
+#define CAPN_MISALIGNED -1
+#define CAPN_NEED_MORE -2
+
+/* capn_deflate deflates a stream to the packed format
+ * capn_inflate inflates a stream from the packed format
+ *
+ * Returns:
+ * CAPN_MISALIGNED - if the unpacked data is not 8 byte aligned
+ * CAPN_NEED_MORE - more packed data/room is required (out for inflate, in for
+ * deflate)
+ * 0 - success, all output for inflate, all input for deflate processed
+ */
+intern int capn_deflate(struct capn_stream*);
+intern int capn_inflate(struct capn_stream*);
+
+
+#endif /* CAPNP_PRIV_H */