diff --git a/libcxx/Makefile b/libcxx/Makefile
index 316cf8ed6931..20102c8abac0 100644
--- a/libcxx/Makefile
+++ b/libcxx/Makefile
@@ -30,6 +30,8 @@ installsrc:: $(SRCROOT)
 
 clean::
 
+installhdrs:: do-installhdrs
+
 # The do-installhdrs target is also used by clang's runtime/libcxx makefile.
 do-installhdrs:
 	mkdir -p $(HEADER_DIR)/c++/v1/ext