diff --git a/package/sane-airscan/Config.in b/package/sane-airscan/Config.in
index 2324a3f661..63ef06b582 100644
--- a/package/sane-airscan/Config.in
+++ b/package/sane-airscan/Config.in
@@ -2,6 +2,7 @@ config BR2_PACKAGE_SANE_AIRSCAN
 	bool "sane-airscan"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on !BR2_STATIC_LIBS # avahi, gnutls, sane-backends
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on BR2_TOOLCHAIN_HAS_THREADS # avahi, dbus
 	depends on BR2_USE_WCHAR # avahi, gnutls
 	depends on BR2_USE_MMU # dbus, sane-backends
@@ -26,5 +27,6 @@ config BR2_PACKAGE_SANE_AIRSCAN
 
 comment "sane-airscan needs a toolchain w/ wchar, dynamic library, threads, C++"
 	depends on BR2_USE_MMU
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on !BR2_USE_WCHAR || BR2_STATIC_LIBS || \
 		!BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP