diff --git a/Makefile.inc b/Makefile.inc
index ff8aacd..9ec61ab 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -1,7 +1,7 @@
 CC=gcc
 IFLAGS=-I /usr/local/include -I include
 CFLAGS=-g
-LDFLAGS=-lbtc
+LDFLAGS=-lbtc -lsecp256k1
 OBJDIR=obj
 BINDIR=bin
 SRCDIR=src