diff --git a/var/spack/repos/builtin/packages/pflotran/package.py b/var/spack/repos/builtin/packages/pflotran/package.py
index 57a409b150c..37fecbe31c3 100644
--- a/var/spack/repos/builtin/packages/pflotran/package.py
+++ b/var/spack/repos/builtin/packages/pflotran/package.py
@@ -57,3 +57,9 @@ def flag_handler(self, name, flags):
         if "%gcc@10:" in self.spec and name == "fflags":
             flags.append("-fallow-argument-mismatch")
         return flags, None, None
+
+    @when("@5.0.0")
+    def patch(self):
+        filter_file(
+            "use iso_[cC]_binding", "use, intrinsic :: iso_c_binding", "src/pflotran/hdf5_aux.F90"
+        )