diff --git a/include/iscsi.h b/include/iscsi.h
index 0f0f07a..4878166 100644
--- a/include/iscsi.h
+++ b/include/iscsi.h
@@ -33,6 +33,9 @@ extern "C" {
 struct iscsi_context;
 struct sockaddr;
 
+/* API VERSION */
+#define LIBISCSI_API_VERSION (20131020)
+
 /* FEATURES */
 #define LIBISCSI_FEATURE_IOVECTOR (1)
 #define LIBISCSI_FEATURE_NOP_COUNTER (1)