diff --git a/components/esmterrain/storage.cpp b/components/esmterrain/storage.cpp
index 267b831ec..cead73070 100644
--- a/components/esmterrain/storage.cpp
+++ b/components/esmterrain/storage.cpp
@@ -3,6 +3,8 @@
 #include <set>
 #include <iostream>
 
+#include <OpenThreads/ScopedLock>
+
 #include <osg/Image>
 #include <osg/Plane>
 
@@ -498,6 +500,8 @@ namespace ESMTerrain
 
     Terrain::LayerInfo Storage::getLayerInfo(const std::string& texture)
     {
+        OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mLayerInfoMutex);
+
         // Already have this cached?
         std::map<std::string, Terrain::LayerInfo>::iterator found = mLayerInfoMap.find(texture);
         if (found != mLayerInfoMap.end())
diff --git a/components/esmterrain/storage.hpp b/components/esmterrain/storage.hpp
index 5b8ca953d..9ca39e6f3 100644
--- a/components/esmterrain/storage.hpp
+++ b/components/esmterrain/storage.hpp
@@ -1,6 +1,8 @@
 #ifndef COMPONENTS_ESM_TERRAIN_STORAGE_H
 #define COMPONENTS_ESM_TERRAIN_STORAGE_H
 
+#include <OpenThreads/Mutex>
+
 #include <components/terrain/storage.hpp>
 
 #include <components/esm/loadland.hpp>
@@ -105,6 +107,7 @@ namespace ESMTerrain
         std::string getTextureName (UniqueTextureId id);
 
         std::map<std::string, Terrain::LayerInfo> mLayerInfoMap;
+        OpenThreads::Mutex mLayerInfoMutex;
 
         Terrain::LayerInfo getLayerInfo(const std::string& texture);
     };