diff --git a/project.mak b/project.mak
index 82a5aba..e857946 100644
--- a/project.mak
+++ b/project.mak
@@ -71,16 +71,16 @@ tests:
 	make -C tests test
 
 zarith.cma: $(MLSRC:%.ml=%.cmo)
-	$(OCAMLMKLIB) $(DEBUG) -failsafe -o zarith $+ $(LIBS)
+	$(OCAMLMKLIB) $(DEBUG) -failsafe -o zarith $+ -ldopt "$(LIBS)"
 
 zarith.cmxa: $(MLSRC:%.ml=%.cmx)
-	$(OCAMLMKLIB) $(DEBUG) -failsafe -o zarith $+ $(LIBS)
+	$(OCAMLMKLIB) $(DEBUG) -failsafe -o zarith $+ -ldopt "$(LIBS)"
 
 zarith.cmxs: zarith.cmxa libzarith.$(LIBSUFFIX)
 	$(OCAMLOPT) -shared -o $@ -I . zarith.cmxa -linkall
 
 libzarith.$(LIBSUFFIX): $(CSRC:%.c=%.$(OBJSUFFIX))
-	$(OCAMLMKLIB) $(DEBUG) -failsafe -o zarith $+ $(LIBS)
+	$(OCAMLMKLIB) $(DEBUG) -failsafe -o zarith $+ -ldopt "$(LIBS)"
 
 zarith_top.cma: zarith_top.cmo
 	$(OCAMLC) $(DEBUG) -o $@ -a $<