diff --git a/src/Profile.cpp b/src/Profile.cpp
index 44d048a070..ae8f9c55d7 100644
--- a/src/Profile.cpp
+++ b/src/Profile.cpp
@@ -3870,7 +3870,15 @@ class LunaScoreGoal : public Luna<ScoreGoal>
 		return 1;
 	}
 
-	static int SetPriority(T* p, lua_State *L) { p->priority = IArg(1); return 1; }
+	static int SetPriority(T* p, lua_State *L) {
+		if (!p->achieved) {
+			int newpriority = IArg(1);
+			CLAMP(newpriority, 0, 100);
+			p->priority = newpriority;
+		}
+		return 1;
+	}
+
 	static int SetComment(T* p, lua_State *L) { p->comment = SArg(1); return 1; }
 
 	LunaScoreGoal()