diff --git a/src/internal/sofort_driver_impl.h b/src/internal/sofort_driver_impl.h
index 0808b55..4fdcf96 100644
--- a/src/internal/sofort_driver_impl.h
+++ b/src/internal/sofort_driver_impl.h
@@ -35,4 +35,17 @@ struct sfrt_unit_ctx_impl {
 	struct sfrt_unit_ctx	uctx;
 };
 
+static inline struct sfrt_driver_ctx_impl * sfrt_get_driver_ictx(
+	const struct sfrt_driver_ctx * dctx)
+{
+        uintptr_t addr;
+
+        if (dctx) {
+                addr = (uintptr_t)dctx - offsetof(struct sfrt_driver_ctx_impl,ctx);
+                return (struct sfrt_driver_ctx_impl *)addr;
+        }
+
+        return 0;
+}
+
 #endif