diff --git a/contrib/Tetgen_old/Makefile b/contrib/Tetgen_old/Makefile
index 7bcfe016fb238e68843a2e58e5b56c9660cfba4b..f20b3c38e63673af31a93b9636d78f62a09f16fe 100644
--- a/contrib/Tetgen_old/Makefile
+++ b/contrib/Tetgen_old/Makefile
@@ -10,7 +10,8 @@ LIB = ../../lib/libGmshTetgen${LIBEXT}
 # Don't optimize Tetgen
 CFLAGS = ${FLAGS} ${DASH}DTETLIBRARY
 
-SRC = tetgen.cxx
+SRC = tetgen.cxx \
+      predicates.cxx
 
 OBJ = ${SRC:.cxx=${OBJEXT}}