diff --git a/nix/local.mk b/nix/local.mk
index 4452301c63..39717711f8 100644
--- a/nix/local.mk
+++ b/nix/local.mk
@@ -22,7 +22,7 @@
 #
 
 BUILT_SOURCES += %D%/libstore/schema.sql.hh
-CLEANFILES += $(BUILT_SOURCES)
+CLEANFILES += %D%/libstore/schema.sql.hh
 
 noinst_LIBRARIES = libformat.a libutil.a libstore.a