diff --git a/conversion/u16toa_destructive.z80 b/conversion/u16toa_destructive.z80
index 8dc988b..1e6009a 100644
--- a/conversion/u16toa_destructive.z80
+++ b/conversion/u16toa_destructive.z80
@@ -72,7 +72,7 @@ u16toa:
 ;Make sure that the string is non-empty!
   xor a
   cp (hl)
-  ret z
+  ret nz
   dec hl
   ret
 #endif