diff --git a/c_src/enacl_nif.c b/c_src/enacl_nif.c
index 5b63ffa..c3ae882 100644
--- a/c_src/enacl_nif.c
+++ b/c_src/enacl_nif.c
@@ -2,6 +2,10 @@
 
 #include <sodium.h>
 
+#ifndef ERL_NIF_DIRTY_SCHEDULER_SUPPORT
+# error Requires dirty schedulers
+#endif
+
 /* Errors */
 static
 ERL_NIF_TERM nacl_error_tuple(ErlNifEnv *env, char *error_atom) {