diff --git a/c_src/enacl_nif.c b/c_src/enacl_nif.c
index 8655eb9..52bbc7d 100644
--- a/c_src/enacl_nif.c
+++ b/c_src/enacl_nif.c
@@ -14,8 +14,6 @@
 #include "secret.h"
 #include "sign.h"
 
-#define CRYPTO_SIGN_STATE_RESOURCE "crypto_sign_state"
-
 #ifdef ERL_NIF_DIRTY_JOB_CPU_BOUND
 #define erl_nif_dirty_job_cpu_bound_macro(a, b, c)                             \
   { a, b, c, ERL_NIF_DIRTY_JOB_CPU_BOUND }