diff --git a/package/libudfread/Config.in b/package/libudfread/Config.in
index 8d42570500..c1f3f23af9 100644
--- a/package/libudfread/Config.in
+++ b/package/libudfread/Config.in
@@ -1,6 +1,10 @@
 config BR2_PACKAGE_LIBUDFREAD
 	bool "libudfread"
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_THREADS
 	help
 	  UDF reader
 
 	  https://code.videolan.org/videolan/libudfread
+
+comment "libudfread needs a toolchain w/ threads"
+	depends on !BR2_TOOLCHAIN_HAS_SYNC_4 && !BR2_TOOLCHAIN_HAS_THREADS