diff --git a/environ.c b/environ.c
index d855f8b5..31e57e0e 100644
--- a/environ.c
+++ b/environ.c
@@ -195,19 +195,11 @@ environ_update(const char *vars, struct environ *srcenv,
 void
 environ_push(struct environ *env)
 {
-	struct environ_entry	 *envent;
-	char			*v;
-
-	while (*environ != NULL) {
-		v = xstrdup(*environ);
-		v[strcspn(v, "=")] = '\0';
-
-		unsetenv(v);
-		free(v);
-	}
+	struct environ_entry	*envent;
 
+	environ = xcalloc(1, sizeof *environ);
 	RB_FOREACH(envent, environ, env) {
-		if (envent->value != NULL)
+		if (envent->value != NULL && *envent->name != '\0')
 			setenv(envent->name, envent->value, 1);
 	}
 }