diff --git a/profiles/package.mask b/profiles/package.mask
index 157e6d6b2982e..fa647cbbff435 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -29,6 +29,11 @@
 
 #--- END OF EXAMPLES ---
 
+# Andreas Sturmlechner <asturm@gentoo.org> (10 May 2018)
+# Depends on dead Qt4, dead upstream.
+# Masked for removal in 30 days. Bugs #408651, #642950, #651622
+media-gfx/structure-synth
+
 # Andreas Sturmlechner <asturm@gentoo.org> (10 May 2018)
 # Depends on dead Qt4, dead upstream.
 # Masked for removal in 30 days. Bug #640258