diff --git a/ninjabackend.py b/ninjabackend.py
index 9081736ee..19f584f1d 100644
--- a/ninjabackend.py
+++ b/ninjabackend.py
@@ -1142,6 +1142,8 @@ rule FORTRAN_DEP_HACK
                 args = [x.replace("@INPUT@", infilename).replace('@OUTPUT@', sole_output)\
                         for x in base_args]
                 args = self.replace_outputs(args, self.get_target_private_dir_abs(target), outfilelist)
+                # We have consumed output files, so drop them from the list of remaining outputs.
+                outfilelist = outfilelist[len(generator.outputs):]
                 relout = self.get_target_private_dir(target)
                 args = [x.replace("@SOURCE_DIR@", self.build_to_src).replace("@BUILD_DIR@", relout)
                         for x in args]