diff --git a/var/spack/repos/builtin/packages/g2/package.py b/var/spack/repos/builtin/packages/g2/package.py
index 1d47e4ee3b89cf..ea3bb603442dd1 100644
--- a/var/spack/repos/builtin/packages/g2/package.py
+++ b/var/spack/repos/builtin/packages/g2/package.py
@@ -59,6 +59,19 @@ def cmake_args(self):
 
         return args
 
+    # https://github.com/JCSDA/spack/issues/475
+    def flag_handler(self, name, flags):
+        if self.spec.satisfies("@3.5.1") and name == "fflags" and "gfortran" in self.compiler.fc:
+            with self.compiler.compiler_environment():
+                gfortran_major_version = int(
+                    spack.compiler.get_compiler_version_output(
+                        self.compiler.fc, "-dumpversion"
+                    ).split(".")[0]
+                )
+            if gfortran_major_version < 10:
+                flags.append("-fno-range-check")
+        return (None, None, flags)
+
     def setup_run_environment(self, env):
         precisions = (
             self.spec.variants["precision"].value if self.spec.satisfies("@3.4.6:") else ("4", "d")