diff --git a/Makefile b/Makefile
index 07849fd..abe3e5e 100644
--- a/Makefile
+++ b/Makefile
@@ -20,8 +20,8 @@ install:
 		cp fvn.mod $(BTREE)/modules
 		cp $(library) $(BTREE)/lib
 		( cd fvn_fnlib ; make install )
-		( cp fvn_sparse/UMFPACK/Lib/libumfpack.a $(BTREE)/lib/libumfpack.lib )
-		( cp fvn_sparse/AMD/Lib/libamd.a $(BTREE)/lib/libamd.lib )
+		( cp fvn_sparse/UMFPACK/Lib/libumfpack.a $(BTREE)/lib/libumfpack$(libext) )
+		( cp fvn_sparse/AMD/Lib/libamd.a $(BTREE)/lib/libamd$(libext) )
 
 %.o: %.f90
 		$(F95) $(F95FLAGS) -c $< -o $@