diff --git a/src/libstore/unix/build/derivation-builder.cc b/src/libstore/unix/build/derivation-builder.cc
index 7c326371f..ce335ab19 100644
--- a/src/libstore/unix/build/derivation-builder.cc
+++ b/src/libstore/unix/build/derivation-builder.cc
@@ -15,6 +15,7 @@
 #include "nix/store/posix-fs-canonicalise.hh"
 #include "nix/util/posix-source-accessor.hh"
 #include "nix/store/restricted-store.hh"
+#include "nix/store/user-lock.hh"
 
 #include <queue>
 
diff --git a/src/libstore/unix/include/nix/store/build/derivation-builder.hh b/src/libstore/unix/include/nix/store/build/derivation-builder.hh
index 8a36a6a8f..a7ebb6c84 100644
--- a/src/libstore/unix/include/nix/store/build/derivation-builder.hh
+++ b/src/libstore/unix/include/nix/store/build/derivation-builder.hh
@@ -8,7 +8,6 @@
 #include "nix/store/parsed-derivations.hh"
 #include "nix/util/processes.hh"
 #include "nix/store/restricted-store.hh"
-#include "nix/store/user-lock.hh"
 
 namespace nix {