diff --git a/library/Makefile b/library/Makefile
index ac8f331..a1c4bb9 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -84,6 +84,7 @@
 	     base64.o \
 	     bignum.o \
 	     bignum_new.o \
+	     bignum_core.o \
 	     camellia.o \
 	     ccm.o \
 	     chacha20.o \