diff --git a/target/imagebuilder/Config.in b/target/imagebuilder/Config.in
index 64fc4051c9..0d19bed1c1 100644
--- a/target/imagebuilder/Config.in
+++ b/target/imagebuilder/Config.in
@@ -3,6 +3,7 @@ config IB
 	depends !TARGET_ROOTFS_INITRAMFS
 	depends !TARGET_uml
 	depends !PROFILE_KCONFIG
+	depends !EXTERNAL_TOOLCHAIN
 	select ALL
 	help
 	  This is essentially a stripped-down version of the buildroot
diff --git a/target/sdk/Config.in b/target/sdk/Config.in
index f6135b6398..c8106d2abf 100644
--- a/target/sdk/Config.in
+++ b/target/sdk/Config.in
@@ -1,5 +1,6 @@
 config SDK
 	bool "Build the OpenWrt SDK"
+	depends !EXTERNAL_TOOLCHAIN
 	help
 	  This is essentially a stripped-down version of the buildroot
 	  with a precompiled toolchain. It can be used to develop and