diff --git a/ccan/README b/ccan/README
index ad5b8d61f..17f9a28d1 100644
--- a/ccan/README
+++ b/ccan/README
@@ -1,3 +1,3 @@
 CCAN imported from http://ccodearchive.net.
 
-CCAN version: init-2548-gab87e56b
+CCAN version: init-2549-gba79e21b
diff --git a/ccan/ccan/tcon/tcon.h b/ccan/ccan/tcon/tcon.h
index e0f84b383..df3aac88b 100644
--- a/ccan/ccan/tcon/tcon.h
+++ b/ccan/ccan/tcon/tcon.h
@@ -147,8 +147,7 @@
  * It evaluates to @x so you can chain it.
  */
 #define tcon_check_ptr(x, canary, expr)				\
-	(sizeof(&(x)->_tcon[0].canary == (expr)) ? (x) : (x))
-
+	(sizeof((expr) ? (expr) : &(x)->_tcon[0].canary) ? (x) : (x))
 
 /**
  * tcon_type - the type within a container (or void *)