diff --git a/src/Makefile.am b/src/Makefile.am
index 57af82a..d45007e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,6 +4,8 @@
 libstdplus_la_SOURCES =
 libstdplus_la_LIBADD = $(COMMON_LIBS)
 
+nobase_include_HEADERS += stdplus/handle/copyable.hpp
+
 nobase_include_HEADERS += stdplus/handle/managed.hpp
 
 nobase_include_HEADERS += stdplus/signal.hpp