diff --git a/var/spack/repos/builtin/packages/claw/package.py b/var/spack/repos/builtin/packages/claw/package.py
index 1f14ee88a40..d905faf2bc8 100644
--- a/var/spack/repos/builtin/packages/claw/package.py
+++ b/var/spack/repos/builtin/packages/claw/package.py
@@ -30,4 +30,7 @@ def cmake_args(self):
         args.append('-DOMNI_CONF_OPTION=--with-libxml2={0}'.
                     format(spec['libxml2'].prefix))
 
+        args.append('-DCMAKE_Fortran_COMPILER={0}'.
+                    format(self.compiler.fc))
+
         return args