diff --git a/radio/1.6/types.hal b/radio/1.6/types.hal
index 20dc612..bc3df13 100644
--- a/radio/1.6/types.hal
+++ b/radio/1.6/types.hal
@@ -280,7 +280,7 @@
      * suggestion. 0 indicates retry should be performed immediately. 0x7fffffffffffffff indicates
      * the device should not retry data setup anymore.
      */
-    uint64_t suggestedRetryTime;
+    int64_t suggestedRetryTime;
 
     /** Context ID, uniquely identifies this data connection. */
     int32_t cid;