diff --git a/libtommath/Makefile.in b/libtommath/Makefile.in
index 961b92aef19123fb773bb303d7074d34fe9e8afb..3ade09056f6da18a94f8dc1e27e03e6c5fb644ef 100644
--- a/libtommath/Makefile.in
+++ b/libtommath/Makefile.in
@@ -170,8 +170,8 @@ clean:
 	rm -f *.bat *.pdf *.o *.a *.obj *.lib *.exe *.dll etclib/*.o demo/demo.o test ltmtest mpitest mtest/mtest mtest/mtest.exe \
         *.idx *.toc *.log *.aux *.dvi *.lof *.ind *.ilg *.ps *.log *.s mpi.c *.da *.dyn *.dpi tommath.tex `find . -type f | grep [~] | xargs` *.lo *.la
 	rm -rf .libs
-	cd etc ; MAKE=${MAKE} ${MAKE} clean
-	cd pics ; MAKE=${MAKE} ${MAKE} clean
+	-cd etc && MAKE=${MAKE} ${MAKE} clean
+	-cd pics && MAKE=${MAKE} ${MAKE} clean
 
 #zipup the project (take that!)
 no_oops: clean