diff --git a/src/h/external.h b/src/h/external.h
index c5c29f7c5..1ac0ecef8 100755
--- a/src/h/external.h
+++ b/src/h/external.h
@@ -1911,10 +1911,10 @@ extern ECL_API cl_object si_waitpid(cl_object pid, cl_object wait);
 extern ECL_API cl_object si_killpid(cl_object pid, cl_object signal);
 
 extern ECL_API cl_object si_run_program_inner
-(cl_object command, cl_object argv, cl_object environ);
+(cl_object command, cl_object argv, cl_object environment);
 
 extern ECL_API cl_object si_spawn_subprocess
-(cl_object command, cl_object argv, cl_object environ,
+(cl_object command, cl_object argv, cl_object environment,
  cl_object input, cl_object output, cl_object error);