diff --git a/utils/astman.c b/utils/astman.c
index 459eeee71b..88573e5f9f 100644
--- a/utils/astman.c
+++ b/utils/astman.c
@@ -387,7 +387,7 @@ static int input_check(struct ast_mansession *s, struct message **mout)
 				}
 				if (process_message(s, &m))
 					break;
-				memset(&m, 0, sizeof(&m));
+				memset(&m, 0, sizeof(m));
 			} else if (m.hdrcount < MAX_HEADERS - 1)
 				m.hdrcount++;
 		} else if (res < 0) {