diff --git a/client/windows/CAdvmapInterface.cpp b/client/windows/CAdvmapInterface.cpp
index 80fdd9713..d50488272 100644
--- a/client/windows/CAdvmapInterface.cpp
+++ b/client/windows/CAdvmapInterface.cpp
@@ -880,7 +880,7 @@ void CAdvMapInt::updateMoveHero(const CGHeroInstance *h, tribool hasPath)
 	if(boost::logic::indeterminate(hasPath))
 		hasPath = LOCPLINT->paths[h].nodes.size() ? true : false;
 
-	moveHero->block(!hasPath || (h->movement == 0));
+	moveHero->block(!(bool)hasPath || (h->movement == 0));
 }
 
 void CAdvMapInt::updateSpellbook(const CGHeroInstance *h)