diff --git a/src/libstore/optimise-store.cc b/src/libstore/optimise-store.cc
index 2c3f59a724..c05447f4a2 100644
--- a/src/libstore/optimise-store.cc
+++ b/src/libstore/optimise-store.cc
@@ -1,3 +1,5 @@
+#include "config.h"
+
 #include "util.hh"
 #include "local-store.hh"
 #include "immutable.hh"
@@ -67,7 +69,6 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path)
     /* We can hard link regular files and maybe symlinks. */
     if (!S_ISREG(st.st_mode)
 #if CAN_LINK_SYMLINK
-        x
         && !S_ISLNK(st.st_mode)
 #endif
         ) return;