diff --git a/aegisub/src/command/subtitle.cpp b/aegisub/src/command/subtitle.cpp
index d7f92b826..300e1af3f 100644
--- a/aegisub/src/command/subtitle.cpp
+++ b/aegisub/src/command/subtitle.cpp
@@ -350,10 +350,15 @@ struct subtitle_save : public Command {
 	STR_MENU("&Save Subtitles")
 	STR_DISP("Save Subtitles")
 	STR_HELP("Saves subtitles.")
+	CMD_TYPE(COMMAND_VALIDATE)
 
 	void operator()(agi::Context *c) {
 		save_subtitles(c, c->ass->CanSave() ? c->ass->filename : "");
 	}
+
+	bool Validate(const agi::Context *c) {
+		return c->ass->IsModified();
+	}
 };