diff --git a/common/type_to_string.c b/common/type_to_string.c
index de50e4096..13afd7ee9 100644
--- a/common/type_to_string.c
+++ b/common/type_to_string.c
@@ -1,3 +1,4 @@
+#include <assert.h>
 #include <bitcoin/preimage.h>
 #include <ccan/crypto/ripemd160/ripemd160.h>
 #include <ccan/crypto/sha256/sha256.h>
@@ -5,7 +6,6 @@
 #include <common/type_to_string.h>
 #include <common/utils.h>
 #include <inttypes.h>
-#include <assert.h>
 
 /* We need at least one, and these are in CCAN so register it here. */
 REGISTER_TYPE_TO_HEXSTR(sha256);