diff --git a/package/moarvm/Config.in b/package/moarvm/Config.in
index 95f37522be..dcd353f889 100644
--- a/package/moarvm/Config.in
+++ b/package/moarvm/Config.in
@@ -4,6 +4,8 @@ config BR2_PACKAGE_MOARVM
 	depends on !BR2_STATIC_LIBS # libuv
 	depends on BR2_USE_MMU # libuv
 	depends on BR2_PACKAGE_LIBATOMIC_ARCH_SUPPORTS # libatomic_ops
+	# needs AO_fetch_compare_and_swap, not implemented for sparcv9
+	depends on !BR2_sparc64
 	select BR2_PACKAGE_LIBUV
 	select BR2_PACKAGE_LIBATOMIC_OPS
 	help
@@ -16,4 +18,5 @@ comment "moarvm needs a toolchain w/ threads, dynamic library"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
 	depends on BR2_USE_MMU
 	depends on BR2_PACKAGE_LIBATOMIC_ARCH_SUPPORTS
+	depends on !BR2_sparc64