diff --git a/local.mk b/local.mk
index 67ec35dcd..b27c7031e 100644
--- a/local.mk
+++ b/local.mk
@@ -2,7 +2,7 @@ GLOBAL_CXXFLAGS += -Wno-deprecated-declarations -Werror=switch
 # Allow switch-enum to be overridden for files that do not support it, usually because of dependency headers.
 ERROR_SWITCH_ENUM = -Werror=switch-enum
 
-$(foreach i, config.h $(wildcard src/lib*/*.hh) $(wildcard src/lib*/*.h $(filter-out %_internal.h, $(wildcard src/lib*c/*.h))), \
+$(foreach i, config.h $(wildcard src/lib*/*.hh) $(filter-out %_internal.h, $(wildcard src/lib*c/*.h)), \
   $(eval $(call install-file-in, $(i), $(includedir)/nix, 0644)))
 
 ifdef HOST_UNIX