diff --git a/etc/bashrc.sh b/etc/bashrc.sh
index a2bb83f9da9..55820a31a63 100644
--- a/etc/bashrc.sh
+++ b/etc/bashrc.sh
@@ -47,7 +47,9 @@ for i in $NIX_PROFILES; do # !!! reverse
         export ACLOCAL_PATH="$i/share/aclocal:$ACLOCAL_PATH"
     fi
 
-    export PERL5LIB="$i/lib/site_perl:$PERL5LIB"
+    # "lib/site_perl" is for backwards compatibility with packages
+    # from Nixpkgs <= 0.12.
+    export PERL5LIB="$i/lib/perl5/site_perl:$i/lib/site_perl:$PERL5LIB"
 
     # GStreamer.
     export GST_PLUGIN_PATH="$i/lib/gstreamer-0.10:$GST_PLUGIN_PATH"