diff --git a/doc-tools-check-languages.conf b/doc-tools-check-languages.conf
index 2cd5c34edb..1d1dd92793 100644
--- a/doc-tools-check-languages.conf
+++ b/doc-tools-check-languages.conf
@@ -41,5 +41,5 @@ declare -A SPECIAL_BOOKS=(
     # Skip guide while it's moved to RST.
     ["install-guide-rst"]="skip"
     # This needs special handling, handle it with the RST tools.
-    ["common-rst"] = "RST"
+    ["common-rst"]="RST"
 )