diff --git a/programming/misc/libsigc++3/pspec.xml b/programming/misc/libsigc++3/pspec.xml
index 9fe05dcf06..36386f177e 100644
--- a/programming/misc/libsigc++3/pspec.xml
+++ b/programming/misc/libsigc++3/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>libsigc++3</Name>