diff --git a/profiles/package.mask b/profiles/package.mask
index 431ea2af0c194..337b78b8daf43 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -29,6 +29,11 @@
 
 #--- END OF EXAMPLES ---
 
+# Andreas Sturmlechner <asturm@gentoo.org> (04 Mar 2018)
+# Dead upstream, depends on deprecated Qt4.
+# Masked for removal in 30 days. Bug 514438, 644522
+sci-chemistry/gsim
+
 # Andreas Sturmlechner <asturm@gentoo.org> (04 Mar 2018)
 # Depends on deprecated dev-python/pyqwt, blocks Qt4 removal.
 # Masked for removal in 30 days unless someone bumps to 5.2.2.