diff --git a/src/Makefile.am b/src/Makefile.am
index 8761d3fdb753..a986440e66c2 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -324,7 +324,7 @@ crypto_libbitcoin_crypto_a_SOURCES = \
   crypto/sph_types.h
 
 # libzerocoin library
-libzerocoin_libbitcoin_zerocin_a_CPPFLAGS = $(AM_CPPFLAGS)
+libzerocoin_libbitcoin_zerocin_a_CPPFLAGS = $(AM_CPPFLAGS) $(BOOST_CPPFLAGS)
 libzerocoin_libbitcoin_zerocin_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libzerocoin_libbitcoin_zerocoin_a_SOURCES = \
   libzerocoin/Accumulator.h \