diff --git a/apps/mwinterpreter/context.cpp b/apps/mwinterpreter/context.cpp
index 5d27a8fe36..ecf4bd8290 100644
--- a/apps/mwinterpreter/context.cpp
+++ b/apps/mwinterpreter/context.cpp
@@ -101,7 +101,7 @@ namespace SAInterpreter
 
     void Context::setGlobalFloat (const std::string& name, float value) {}
                     
-    bool Context::isScriptRunning (const std::string& name)
+    bool Context::isScriptRunning (const std::string& name) const
     {
         return false;
     }
@@ -110,7 +110,7 @@ namespace SAInterpreter
     
     void Context::stopScript (const std::string& name) {}
     
-    float Context::getDistance (const std::string& name)
+    float Context::getDistance (const std::string& name) const
     {
         return 0;
     }
diff --git a/apps/mwinterpreter/context.hpp b/apps/mwinterpreter/context.hpp
index e9535e9182..48ba40ca30 100644
--- a/apps/mwinterpreter/context.hpp
+++ b/apps/mwinterpreter/context.hpp
@@ -52,13 +52,13 @@ namespace SAInterpreter
 
             virtual void setGlobalFloat (const std::string& name, float value);
             
-            virtual bool isScriptRunning (const std::string& name);
+            virtual bool isScriptRunning (const std::string& name) const;
             
             virtual void startScript (const std::string& name);
             
             virtual void stopScript (const std::string& name);
             
-            virtual float getDistance (const std::string& name);
+            virtual float getDistance (const std::string& name) const;
             
             virtual float getSecondsPassed() const;
             
diff --git a/apps/openmw/mwscript/interpretercontext.cpp b/apps/openmw/mwscript/interpretercontext.cpp
index 92840fdd58..0b1610f4f6 100644
--- a/apps/openmw/mwscript/interpretercontext.cpp
+++ b/apps/openmw/mwscript/interpretercontext.cpp
@@ -125,7 +125,7 @@ namespace MWScript
             *reinterpret_cast<Interpreter::Type_Data *> (&value);    
     }
      
-    bool InterpreterContext::isScriptRunning (const std::string& name)
+    bool InterpreterContext::isScriptRunning (const std::string& name) const
     {
         return mEnvironment.mGlobalScripts->isRunning (name);
     }
@@ -140,7 +140,7 @@ namespace MWScript
         mEnvironment.mGlobalScripts->removeScript (name);
     }
     
-    float InterpreterContext::getDistance (const std::string& name)
+    float InterpreterContext::getDistance (const std::string& name) const
     {
         if (mReference.isEmpty())
             throw std::runtime_error ("no implicit reference");
diff --git a/apps/openmw/mwscript/interpretercontext.hpp b/apps/openmw/mwscript/interpretercontext.hpp
index 4b3dfa124e..9477562620 100644
--- a/apps/openmw/mwscript/interpretercontext.hpp
+++ b/apps/openmw/mwscript/interpretercontext.hpp
@@ -61,13 +61,13 @@ namespace MWScript
 
             virtual void setGlobalFloat (const std::string& name, float value);
             
-            virtual bool isScriptRunning (const std::string& name);
+            virtual bool isScriptRunning (const std::string& name) const;
             
             virtual void startScript (const std::string& name);
             
             virtual void stopScript (const std::string& name);
                         
-            virtual float getDistance (const std::string& name);
+            virtual float getDistance (const std::string& name) const;
                         
             virtual bool hasBeenActivated() const;
             
diff --git a/components/interpreter/context.hpp b/components/interpreter/context.hpp
index a8f0eaf8b6..34b78d580f 100644
--- a/components/interpreter/context.hpp
+++ b/components/interpreter/context.hpp
@@ -47,13 +47,13 @@ namespace Interpreter
 
             virtual void setGlobalFloat (const std::string& name, float value) = 0;     
             
-            virtual bool isScriptRunning (const std::string& name) = 0;
+            virtual bool isScriptRunning (const std::string& name) const = 0;
             
             virtual void startScript (const std::string& name) = 0;
             
             virtual void stopScript (const std::string& name) = 0;
             
-            virtual float getDistance (const std::string& name) = 0; 
+            virtual float getDistance (const std::string& name) const = 0; 
             
             virtual float getSecondsPassed() const = 0;             
     };