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diff --git a/tests/fuzz/corpora/fuzz-bigsize/e9939eb47fc6d0a49de4e97e786af7899642a5dd b/tests/fuzz/corpora/fuzz-bigsize/e9939eb47fc6d0a49de4e97e786af7899642a5dd
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diff --git a/tests/fuzz/corpora/fuzz-bigsize/f3bd01b03890010cb13e55b7398ea10162c6402b b/tests/fuzz/corpora/fuzz-bigsize/f3bd01b03890010cb13e55b7398ea10162c6402b
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diff --git a/tests/fuzz/corpora/fuzz-bigsize/f96244b471978628b3afc03495a8b28c1b263221 b/tests/fuzz/corpora/fuzz-bigsize/f96244b471978628b3afc03495a8b28c1b263221
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diff --git a/tests/fuzz/corpora/fuzz-bigsize/fbf5cab304acb0fea69dafe91afb3c849741c319 b/tests/fuzz/corpora/fuzz-bigsize/fbf5cab304acb0fea69dafe91afb3c849741c319
new file mode 100644
index 000000000000..bb99b608cc05
--- /dev/null
+++ b/tests/fuzz/corpora/fuzz-bigsize/fbf5cab304acb0fea69dafe91afb3c849741c319
@@ -0,0 +1 @@
+ýý
\ No newline at end of file
diff --git a/tests/fuzz/fuzz-bigsize.c b/tests/fuzz/fuzz-bigsize.c
index 8b8f1ea6d782..3b67f7e257c9 100644
--- a/tests/fuzz/fuzz-bigsize.c
+++ b/tests/fuzz/fuzz-bigsize.c
@@ -14,21 +14,22 @@ void run(const uint8_t *data, size_t size)
 	const uint8_t **wire_chunks, *wire_ptr;
 	size_t wire_max;
 
-	wire_chunks = get_chunks(NULL, data, size, 8);
-	for (size_t i = 0; i < tal_count(wire_chunks); i++) {
-		wire_max = tal_count(wire_chunks[i]);
-		wire_ptr = wire_chunks[i];
+	for (size_t max = 1; max <= BIGSIZE_MAX_LEN; max++) {
+		wire_chunks = get_chunks(NULL, data, size, max);
+		for (size_t i = 0; i < tal_count(wire_chunks); i++) {
+			wire_max = tal_count(wire_chunks[i]);
+			wire_ptr = wire_chunks[i];
 
-		bigsize_t bs = fromwire_bigsize(&wire_ptr, &wire_max);
-		if (bs != 0) {
-			/* We have a valid bigsize type, now we should not error. */
+			bigsize_t bs = fromwire_bigsize(&wire_ptr, &wire_max), bs_decoded;
 			assert(bigsize_put(buff, bs) > 0);
 			assert(bigsize_len(bs));
+			assert(bigsize_get(buff, sizeof(buff), &bs_decoded) == bigsize_len(bs));
+			assert(bs_decoded == bs);
 
 			wire_buff = tal_arr(NULL, uint8_t, 8);
 			towire_bigsize(&wire_buff, bs);
 			tal_free(wire_buff);
 		}
+		tal_free(wire_chunks);
 	}
-	tal_free(wire_chunks);
 }