diff --git a/lib/cuda/Makefile.defaults b/lib/cuda/Makefile.defaults
index 55a65915dc..98628750ec 100644
--- a/lib/cuda/Makefile.defaults
+++ b/lib/cuda/Makefile.defaults
@@ -6,7 +6,7 @@ precision ?= 1
 verbose ?= 1
 
 #GPU architecture (compute capability): 13, 20, 21, 35
-arch ?= 20
+arch ?= 21
 
 #Using cufft (should not be changed)
 cufft ?= 1