diff --git a/makefile.shared b/makefile.shared
index c8dc124..dd80861 100644
--- a/makefile.shared
+++ b/makefile.shared
@@ -47,7 +47,8 @@ src/sqr/fp_sqr_comba_48.o src/sqr/fp_sqr_comba_4.o src/sqr/fp_sqr_comba_64.o src
 src/sqr/fp_sqr_comba_7.o src/sqr/fp_sqr_comba_8.o src/sqr/fp_sqr_comba_9.o src/sqr/fp_sqr_comba.o \
 src/sqr/fp_sqr_comba_generic.o src/sqr/fp_sqr_comba_small_set.o src/sqr/fp_sqrmod.o
 
-HEADERS=src/headers/tfm.h
+HEADERS_PUB:=src/headers/tfm.h
+HEADERS=src/headers/tfm_private.h $(HEADERS_PUB)
 
 #END_INS
 
@@ -94,7 +95,7 @@ install: $(LIBNAME)
 	install -d -g $(GROUP) -o $(USER) $(DESTDIR)$(LIBPATH)
 	libtool --silent --mode=install install -c $(LIBNAME) $(DESTDIR)$(LIBPATH)/$(LIBNAME)
 	install -d -g $(GROUP) -o $(USER) $(DESTDIR)$(INCPATH)
-	install -g $(GROUP) -o $(USER) $(HEADERS) $(DESTDIR)$(INCPATH)
+	install -g $(GROUP) -o $(USER) $(HEADERS_PUB) $(DESTDIR)$(INCPATH)
 
 mtest/mtest: mtest/mtest.c
 	cd mtest ; make mtest