diff --git a/src/Makefile.am b/src/Makefile.am
index ee4491195..132e8cc60 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -262,6 +262,7 @@ libbitcoin_wallet_a_SOURCES = \
 # crypto primitives library
 crypto_libbitcoin_crypto_a_CPPFLAGS = $(AM_CPPFLAGS) $(SSL_CFLAGS)
 crypto_libbitcoin_crypto_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
+crypto_libbitcoin_crypto_a_CFLAGS = $(PIC_FLAGS)
 crypto_libbitcoin_crypto_a_SOURCES = \
   crypto/aes.cpp \
   crypto/aes.h \