diff --git a/mk/spksrc.tc-rust.mk b/mk/spksrc.tc-rust.mk
index fd30bc08684..f95790ca6ef 100644
--- a/mk/spksrc.tc-rust.mk
+++ b/mk/spksrc.tc-rust.mk
@@ -57,7 +57,7 @@ rust_toml:
 	echo 'lto = "off"' ; \
 	echo
 	@echo "[llvm]" ; \
-	echo "download-ci-llvm = if-unchanged" ; \
+	echo 'download-ci-llvm = "if-unchanged"' ; \
 	echo
 	@echo "[install]" ; \
 	echo