diff --git a/mk/config.mk b/mk/config.mk
index b9dc42c..65dd31a 100644
--- a/mk/config.mk
+++ b/mk/config.mk
@@ -6,7 +6,12 @@ INSTALLER_FLAGS?=--cookbook=cookbook
 ## Enabled to use binary prefix (much faster)
 PREFIX_BINARY?=1
 ## Enabled to build custom rustc
-PREFIX_RUSTC?=0
+ifeq ($(ARCH),aarch64)
+	# aarch64 requires rustc prefix
+	PREFIX_RUSTC?=1
+else
+	PREFIX_RUSTC?=0
+endif
 ## Filesystem size in MB (256 is the default)
 FILESYSTEM_SIZE?=256