diff --git a/src/viewport.cpp b/src/viewport.cpp
index 04cdca236a..edba8cd94e 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -1595,7 +1595,7 @@ static bool CheckClickOnSign(const ViewPort *vp, int x, int y)
 {
 	const Sign *si;
 
-	if (!(_display_opt & DO_SHOW_SIGNS)) return false;
+	if (!(_display_opt & DO_SHOW_SIGNS) || _current_player == PLAYER_SPECTATOR) return false;
 
 	switch (vp->zoom) {
 		case 0: