diff --git a/OpenMP/linear-algebra/kernels/atax/atax.h b/OpenMP/linear-algebra/kernels/atax/atax.h
index b640185..933c274 100644
--- a/OpenMP/linear-algebra/kernels/atax/atax.h
+++ b/OpenMP/linear-algebra/kernels/atax/atax.h
@@ -30,8 +30,8 @@
 #  endif
 
 #  ifdef EXTRALARGE_DATASET
-#   define NX 32000
-#   define NY 32000
+#   define NX 12000
+#   define NY 12000
 #  endif
 # endif /* !N */