diff --git a/Modules/_sha3/sha3module.c b/Modules/_sha3/sha3module.c
index 0f47fc3..4e6352b 100644
--- a/Modules/_sha3/sha3module.c
+++ b/Modules/_sha3/sha3module.c
@@ -464,7 +464,7 @@
     }
 
     if (data_obj) {
-#ifdef WITH_THREADS
+#ifdef WITH_THREAD
         if (buf.len >= HASHLIB_GIL_MINSIZE) {
             /* invariant: New objects can't be accessed by other code yet,
              * thus it's safe to release the GIL without locking the object.