diff --git a/wallet/db.c b/wallet/db.c
index 225089ada..e6fe5db4c 100644
--- a/wallet/db.c
+++ b/wallet/db.c
@@ -1,6 +1,5 @@
 #include "db.h"
 
-#include <ccan/str/hex/hex.h>
 #include <ccan/tal/str/str.h>
 #include <ccan/tal/tal.h>
 #include <inttypes.h>
@@ -411,15 +410,6 @@ bool db_set_intvar(struct db *db, char *varname, s64 val)
 		    varname, val);
 }
 
-bool sqlite3_column_hexval(sqlite3_stmt *s, int col, void *dest, size_t destlen)
-{
-	const char *source = sqlite3_column_blob(s, col);
-	size_t sourcelen = sqlite3_column_bytes(s, col);
-	if (sourcelen / 2 != destlen)
-		return false;
-	return hex_decode(source, sourcelen, dest, destlen);
-}
-
 bool sqlite3_bind_short_channel_id(sqlite3_stmt *stmt, int col,
 				   const struct short_channel_id *id)
 {
diff --git a/wallet/db.h b/wallet/db.h
index 5641f25c5..9064bb21d 100644
--- a/wallet/db.h
+++ b/wallet/db.h
@@ -79,12 +79,6 @@ bool db_set_intvar(struct db *db, char *varname, s64 val);
  */
 s64 db_get_intvar(struct db *db, char *varname, s64 defval);
 
-/**
- * sqlite3_column_hexval - Helper to populate a binary field from a hex value
- */
-bool sqlite3_column_hexval(sqlite3_stmt *s, int col, void *dest,
-			   size_t destlen);
-
 /**
  * db_prepare -- Prepare a DB query/command
  *
diff --git a/wallet/wallet.c b/wallet/wallet.c
index 4c790ccd4..a2637d7a7 100644
--- a/wallet/wallet.c
+++ b/wallet/wallet.c
@@ -1,7 +1,6 @@
 #include "wallet.h"
 
 #include <bitcoin/script.h>
-#include <ccan/str/hex/hex.h>
 #include <ccan/tal/str/str.h>
 #include <inttypes.h>
 #include <lightningd/lightningd.h>
diff --git a/wallet/wallet_tests.c b/wallet/wallet_tests.c
index 709a0d073..bba988e53 100644
--- a/wallet/wallet_tests.c
+++ b/wallet/wallet_tests.c
@@ -11,6 +11,20 @@
 void invoice_add(struct invoices *invs,
 		 struct invoice *inv){}
 
+/**
+ * mempat -- Set the memory to a pattern
+ *
+ * Used mainly to check that we don't mix fields while
+ * serializing/unserializing.
+ */
+static void mempat(void *dst, size_t len)
+{
+	static int n = 0;
+	u8 *p = (u8*)dst;
+	for(int i=0 ; i < len; ++i)
+		p[i] = n % 251; /* Prime */
+}
+
 static struct wallet *create_test_wallet(const tal_t *ctx)
 {
 	char filename[] = "/tmp/ldb-XXXXXX";
@@ -204,12 +218,12 @@ static bool test_channel_crud(const tal_t *ctx)
 	memset(c2, 0, sizeof(*c2));
 	memset(&p, 0, sizeof(p));
 	memset(&ci, 3, sizeof(ci));
-	memset(hash, 'B', sizeof(*hash));
-	memset(sig, 0, sizeof(*sig));
-	memset(&last_commit, 0, sizeof(last_commit));
+	mempat(hash, sizeof(*hash));
+	mempat(sig, sizeof(*sig));
+	mempat(&last_commit, sizeof(last_commit));
 	pubkey_from_der(tal_hexdata(w, "02a1633cafcc01ebfb6d78e39f687a1f0995c62fc95f51ead10a02ee0be551b5dc", 66), 33, &pk);
 	ci.feerate_per_kw = 31337;
-	memset(&p.id, 'A', sizeof(p.id));
+	mempat(&p.id, sizeof(p.id));
 	c1.peer = &p;
 	p.id = pk;
 	p.our_msatoshi = NULL;