diff --git a/macros b/macros
index 6a7cd50..396318c 100644
--- a/macros
+++ b/macros
@@ -14,10 +14,10 @@
 %_prefix		/usr
 %_sysconfdir		/etc
 %_localstatedir		/var
-%_infodir		/usr/share/info
-%_mandir		/usr/share/man
+%_infodir		%{_prefix}/share/info
+%_mandir		%{_prefix}/share/man
 
-%_defaultdocdir		%{_usr}/share/doc
+%_defaultdocdir		%{_prefix}/share/doc
 
 %_fmoddir		%{_libdir}/gfortran/modules