diff --git a/package/php/Config.ext b/package/php/Config.ext
index 463334b3ac..abf4993efb 100644
--- a/package/php/Config.ext
+++ b/package/php/Config.ext
@@ -163,13 +163,14 @@ config BR2_PACKAGE_PHP_EXT_INTL
 	depends on BR2_USE_WCHAR
 	depends on !BR2_arc # icu -> atomic builtins
 	depends on !BR2_BINFMT_FLAT # icu
+	depends on BR2_TOOLCHAIN_HAS_THREADS # icu
 	help
 	  Internationalization support
 
-comment "intl support needs a toolchain w/ C++, wchar"
+comment "intl support needs a toolchain w/ C++, wchar, threads"
 	depends on !BR2_arc
 	depends on !BR2_BINFMT_FLAT
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
 
 comment "Image processing"