diff --git a/lib/mapping/CMap.cpp b/lib/mapping/CMap.cpp
index 3153fb2f1..5fc9f598b 100644
--- a/lib/mapping/CMap.cpp
+++ b/lib/mapping/CMap.cpp
@@ -155,6 +155,7 @@ CMapHeader::~CMapHeader()
 
 CMap::CMap() : checksum(0), grailPos(-1, -1, -1), grailRadious(0), terrain(nullptr)
 {
+	allHeroes.resize(allowedHeroes.size());
 	allowedAbilities = VLC->heroh->getDefaultAllowedAbilities();
 	allowedArtifact = VLC->arth->getDefaultAllowed();
 	allowedSpell = VLC->spellh->getDefaultAllowed();