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diff --git a/libcounter/shm_internal.h b/libcounter/shm_internal.h
new file mode 100644
index 00000000..dcc3aab6
--- /dev/null
+++ b/libcounter/shm_internal.h
@@ -0,0 +1,35 @@
+#ifndef _LIBCOUNTER_SHM_INTERNAL_H
+#define _LIBCOUNTER_SHM_INTERNAL_H
+
+/*
+ * libcounter/shm_internal.h
+ *
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+struct lttng_counter_shm_ref {
+	volatile ssize_t index;		/* within the object table */
+	volatile ssize_t offset;	/* within the object */
+};
+
+#define DECLARE_LTTNG_COUNTER_SHMP(type, name)		\
+	union {						\
+		struct lttng_counter_shm_ref _ref;	\
+		type *_type;				\
+	} name
+
+#endif /* _LIBCOUNTER_SHM_INTERNAL_H */