diff --git a/external/libtompoly-0.04/makefile b/external/libtompoly-0.04/makefile
index af2503e..c14f34d 100644
--- a/external/libtompoly-0.04/makefile
+++ b/external/libtompoly-0.04/makefile
@@ -1,5 +1,5 @@
 #Makefile for GCC by Tom St Denis
-CFLAGS += -fPIC -I. -Os -Wall -W 
+CFLAGS += -fPIC -I. -Os -Wall -W -I../libtommath-0.42.0
 
 VERSION=0.04