diff --git a/packages/opal-x/package.py b/packages/opal-x/package.py
index 53688c6..166f706 100644
--- a/packages/opal-x/package.py
+++ b/packages/opal-x/package.py
@@ -37,6 +37,7 @@ class OpalX(CMakePackage, CudaPackage):
     license("GPLv3")
 
     version('master', branch="master")
+    version('fixSolverUnits', branch="fixSolverUnits")
 
     variant(
         "build_type",