diff --git a/include/spl-ctl.h b/include/spl-ctl.h
new file mode 100644
index 000000000..a20442a8c
--- /dev/null
+++ b/include/spl-ctl.h
@@ -0,0 +1,21 @@
+#ifndef _DEBUG_CTL_H
+#define _DEBUG_CTL_H
+
+/* Contains shared definitions which both the userspace
+ * and kernelspace portions of splat must agree on.
+ */
+
+typedef struct spl_debug_header {
+        int ph_len;
+        int ph_flags;
+        int ph_subsys;
+        int ph_mask;
+        int ph_cpu_id;
+        int ph_sec;
+        long ph_usec;
+        int ph_stack;
+        int ph_pid;
+        int ph_line_num;
+} spl_debug_header_t;
+
+#endif /* _DEBUG_CTL_H */