diff --git a/profiles/package.mask b/profiles/package.mask
index 3f7133b76ab62..355b7bb978cde 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -30,6 +30,13 @@
 
 #--- END OF EXAMPLES ---
 
+# Johannes Huber <johu@gentoo.org> (20 Nov 2016)
+# Masked for removal in 30 days. Dead upstream. Only supports
+# deprecated Plasma 4 only. Fails to build with newer
+# kde-base/kdelibs (bug #558516). Fails to build with ninja
+# (bug #575828).
+x11-themes/crystal
+
 # Kent Fredric (19 Nov 2016)
 # virtual/perl-MathBigInt-1.999.726+ Mask Block
 # Will likely not be unmasked until future Perls