diff --git a/gimli/Implementations/crypto_aead/gimli24v1/rhys/api.h b/gimli/Implementations/crypto_aead/gimli24v1/rhys/api.h
index b2f8a36..fb1dab8 100644
--- a/gimli/Implementations/crypto_aead/gimli24v1/rhys/api.h
+++ b/gimli/Implementations/crypto_aead/gimli24v1/rhys/api.h
@@ -1,4 +1,4 @@
-#define CRYPTO_KEYBYTES 16
+#define CRYPTO_KEYBYTES 32
 #define CRYPTO_NSECBYTES 0 
 #define CRYPTO_NPUBBYTES 16 
 #define CRYPTO_ABYTES 16