diff --git a/apps/opencs/model/world/resources.cpp b/apps/opencs/model/world/resources.cpp
index aeef59fe7..13c8df84d 100644
--- a/apps/opencs/model/world/resources.cpp
+++ b/apps/opencs/model/world/resources.cpp
@@ -3,6 +3,7 @@
 
 #include <sstream>
 #include <stdexcept>
+#include <algorithm>
 
 #include <OgreResourceGroupManager.h>
 
@@ -55,6 +56,7 @@ CSMWorld::Resources::Resources (const std::string& baseDirectory, UniversalId::T
 
             std::string file = iter->substr (baseSize+1);
             mFiles.push_back (file);
+            std::replace (file.begin(), file.end(), '\\', '/');
             mIndex.insert (std::make_pair (
                 Misc::StringUtils::lowerCase (file), static_cast<int> (mFiles.size())-1));
         }
@@ -90,6 +92,8 @@ int CSMWorld::Resources::searchId (const std::string& id) const
 {
     std::string id2 = Misc::StringUtils::lowerCase (id);
 
+    std::replace (id2.begin(), id2.end(), '\\', '/');
+
     std::map<std::string, int>::const_iterator iter = mIndex.find (id2);
 
     if (iter==mIndex.end())