diff --git a/libifupdown/lifecycle.c b/libifupdown/lifecycle.c
index 349e352..8892fc3 100644
--- a/libifupdown/lifecycle.c
+++ b/libifupdown/lifecycle.c
@@ -222,6 +222,9 @@ lif_lifecycle_run_phase(const struct lif_execute_opts *opts, struct lif_interfac
 		while (*ep++)
 		{
 			*ep = toupper(*ep);
+
+			if (*ep == '-')
+				*ep = '_';
 		}
 
 		lif_environment_push(&envp, envkey, (const char *) entry->data);