diff --git a/degesch.c b/degesch.c
index 989c239..b1662ca 100644
--- a/degesch.c
+++ b/degesch.c
@@ -872,7 +872,12 @@ buffer_activate (struct app_context *ctx, struct buffer *buffer)
 	}
 	else
 		// Just throw it away; there should always be an active buffer however
+#if RL_READLINE_VERSION >= 0x0603
 		rl_clear_history ();
+#else // RL_READLINE_VERSION < 0x0603
+		// At least something... this may leak undo entries
+		clear_history ();
+#endif // RL_READLINE_VERSION < 0x0603
 
 	// Now at last we can switch the pointers
 	ctx->current_buffer = buffer;