diff --git a/local.mk b/local.mk
index aaf8f548e1a44267ab2c7160d7b15e657005014b..d9e13a922c8b59ab41556ae584343625f6a38f3a 100644
--- a/local.mk
+++ b/local.mk
@@ -10,4 +10,4 @@ GLOBAL_CXXFLAGS += -I . -I src -I src/libutil -I src/libstore -I src/libmain -I
 
 $(foreach i, config.h $(call rwildcard, src/lib*, *.hh), $(eval $(call install-file-in, $(i), $(includedir)/nix, 0644)))
 
-$(foreach i, config.h $(call rwildcard, src/boost, *.hpp), $(eval $(call install-file-in, $(i), $(includedir)/nix/$(patsubst src/%/,%,$(dir $(i))), 0644)))
+$(foreach i, $(call rwildcard, src/boost, *.hpp), $(eval $(call install-file-in, $(i), $(includedir)/nix/$(patsubst src/%/,%,$(dir $(i))), 0644)))