diff --git a/astlpc.c b/astlpc.c
index 6de3e37..d322b7c 100644
--- a/astlpc.c
+++ b/astlpc.c
@@ -1401,7 +1401,8 @@
 		astlpc_prwarn(astlpc, "LPC mmap failed");
 		rc = -1;
 	} else {
-		astlpc->lpc_map = lpc_map_base + map.size - LPC_WIN_SIZE;
+		astlpc->lpc_map =
+			(uint8_t *)lpc_map_base + map.size - LPC_WIN_SIZE;
 	}
 
 	close(fd);