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-rw-r--r--src/vpp-api/vapi/vapi_common.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/vpp-api/vapi/vapi_common.h b/src/vpp-api/vapi/vapi_common.h
index ce64469d02c..764a0b71f50 100644
--- a/src/vpp-api/vapi/vapi_common.h
+++ b/src/vpp-api/vapi/vapi_common.h
@@ -52,7 +52,9 @@ typedef enum
VAPI_WAIT_FOR_READ_WRITE, /**< wait until a read or write can be done */
} vapi_wait_mode_e;
-typedef int vapi_msg_id_t;
+typedef unsigned int vapi_msg_id_t;
+
+#define INVALID_MSG_ID ((vapi_msg_id_t)(~0))
#ifdef __cplusplus
}