diff --git a/x11/library/libexplain/pspec.xml b/x11/library/libexplain/pspec.xml
index 9cf8f9d993..62ffb6777a 100644
--- a/x11/library/libexplain/pspec.xml
+++ b/x11/library/libexplain/pspec.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" ?>
-<!DOCTYPE PISI SYSTEM "http://www.pisilinux.org/projeler/pisi/pisi-spec.dtd">
+<!DOCTYPE PISI SYSTEM "https://www.pisilinux.org/projeler/pisi/pisi-spec.dtd">
 <PISI>
     <Source>
         <Name>libexplain</Name>