diff --git a/var/spack/repos/builtin/packages/evtgen/package.py b/var/spack/repos/builtin/packages/evtgen/package.py
index 0809a4ba1a0..85f80e03e53 100644
--- a/var/spack/repos/builtin/packages/evtgen/package.py
+++ b/var/spack/repos/builtin/packages/evtgen/package.py
@@ -27,7 +27,7 @@ class Evtgen(CMakePackage):
     variant('hepmc3', default=False, description='Link with hepmc3 (instead of hepmc)')
 
     patch("g2c.patch", when='@01.07.00')
-    patch("evtgen-2.0.0.patch", when='@02.00.00 ^pythia@8.304:')
+    patch("evtgen-2.0.0.patch", when='@02.00.00 ^pythia8@8.304:')
 
     depends_on('hepmc', when='~hepmc3')
     depends_on('hepmc3', when='+hepmc3')