diff --git a/init/Kconfig b/init/Kconfig
index cddeec9..3ada33b 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1919,7 +1919,7 @@
 config RUSTC_VERSION_TEXT
 	string
 	depends on RUST
-	default $(shell,$(RUSTC) --version 2>/dev/null || echo n)
+	default "$(shell,$(RUSTC) --version 2>/dev/null)"
 
 config BINDGEN_VERSION_TEXT
 	string
@@ -1927,7 +1927,7 @@
 	# The dummy parameter `workaround-for-0.69.0` is required to support 0.69.0
 	# (https://github.com/rust-lang/rust-bindgen/pull/2678). It can be removed when
 	# the minimum version is upgraded past that (0.69.1 already fixed the issue).
-	default $(shell,$(BINDGEN) --version workaround-for-0.69.0 2>/dev/null || echo n)
+	default "$(shell,$(BINDGEN) --version workaround-for-0.69.0 2>/dev/null)"
 
 #
 # Place an empty function call at each tracepoint site. Can be