diff --git a/package/kvazaar/Config.in b/package/kvazaar/Config.in
index de2c6c9d87..fb9736920f 100644
--- a/package/kvazaar/Config.in
+++ b/package/kvazaar/Config.in
@@ -2,10 +2,12 @@ config BR2_PACKAGE_KVAZAAR
 	bool "kvazaar"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	help
 	  An open-source HEVC encoder licensed under LGPLv2.1
 
 	  https://github.com/ultravideo/kvazaar
 
 comment "kvazaar needs a toolchain w/ C++, threads"
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS