diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index f3f6d35b9..f452dcb9f 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -335,11 +335,6 @@ private:
 
     std::map<std::string, std::optional<std::string>> searchPathResolved;
 
-    /**
-     * Cache used by checkSourcePath().
-     */
-    std::unordered_map<Path, SourcePath> resolvedPaths;
-
     /**
      * Cache used by prim_match().
      */