diff --git a/src/zarmour.c b/src/zarmour.c

index a0ecc4c2..273eb54c 100644

--- a/src/zarmour.c

+++ b/src/zarmour.c

@@ -655,8 +655,10 @@ s_armour_decode (zarmour_t *self, const char *test_string, const char *expected,

     assert (chunk);

     if (verbose)

         zsys_debug ("    decoded '%s' into '%s'", test_string, (char *) zchunk_data (chunk));

-    assert (zchunk_size (chunk) == strlen (expected) + 1);

-    assert (streq ((char *) zchunk_data (chunk), expected));

+    assert (zchunk_size (chunk) == strlen (expected) + 1

+            || (strlen (expected) == 0 && zchunk_size (chunk) == 0));

+    assert ((strlen (expected) == 0 && zchunk_size (chunk) == 0)

+            || streq ((char *) zchunk_data (chunk), expected));

     zchunk_destroy (&chunk);

 }