diff --git a/src/su.c b/src/su.c
index 6399d7cf8..51e2e8165 100644
--- a/src/su.c
+++ b/src/su.c
@@ -114,11 +114,23 @@ uid_t getuid ();
 
 #include "error.h"
 
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+
 /* The default PATH for simulated logins to non-superuser accounts.  */
+#ifdef _PATH_DEFPATH
+#define DEFAULT_LOGIN_PATH _PATH_DEFPATH
+#else
 #define DEFAULT_LOGIN_PATH ":/usr/ucb:/bin:/usr/bin"
+#endif
 
 /* The default PATH for simulated logins to superuser accounts.  */
+#ifdef _PATH_DEFPATH_ROOT
+#define DEFAULT_ROOT_LOGIN_PATH _PATH_DEFPATH_ROOT
+#else
 #define DEFAULT_ROOT_LOGIN_PATH "/usr/ucb:/bin:/usr/bin:/etc"
+#endif
 
 /* The shell to run if none is given in the user's passwd entry.  */
 #define DEFAULT_SHELL "/bin/sh"