diff --git a/package/rustc/Config.in.host b/package/rustc/Config.in.host
index 13b866345b..d647ae69b2 100644
--- a/package/rustc/Config.in.host
+++ b/package/rustc/Config.in.host
@@ -99,11 +99,15 @@ config BR2_PACKAGE_HOST_RUSTC_TARGET_TIER2_PLATFORMS
 	default y if BR2_sparc64 && BR2_TOOLCHAIN_USES_GLIBC
 
 # All target rust packages should depend on this option
+# Note: With musl based toolchain, we need a C++ cross compiler to
+# build host-rust some target libraries (libunwind) from llvm source
+# code bundled in rust sources.
 config BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS
 	bool
 	default y if BR2_PACKAGE_HOST_RUSTC_TARGET_TIER1_PLATFORMS
 	default y if BR2_PACKAGE_HOST_RUSTC_TARGET_TIER2_HOST_TOOLS_PLATFORMS
 	default y if BR2_PACKAGE_HOST_RUSTC_TARGET_TIER2_PLATFORMS
+	depends on BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_USES_MUSL
 	depends on BR2_PACKAGE_HOST_RUSTC_ARCH_SUPPORTS
 
 config BR2_PACKAGE_HOST_RUSTC_ARCH