diff --git a/simgear/scene/material/Effect.cxx b/simgear/scene/material/Effect.cxx
index 259e6636..92ba1f9c 100644
--- a/simgear/scene/material/Effect.cxx
+++ b/simgear/scene/material/Effect.cxx
@@ -861,6 +861,7 @@ bool Effect::realizeTechniques(const osgDB::ReaderWriter::Options* options)
          itr != e;
          ++itr)
         buildTechnique(this, *itr, options);
+    return true;
 }
 
 bool Effect_writeLocalData(const Object& obj, osgDB::Output& fw)
diff --git a/simgear/scene/material/Technique.hxx b/simgear/scene/material/Technique.hxx
index 26aed909..b2ce020f 100644
--- a/simgear/scene/material/Technique.hxx
+++ b/simgear/scene/material/Technique.hxx
@@ -107,6 +107,7 @@ protected:
         ContextInfo& operator=(const ContextInfo& rhs)
         {
             valid = rhs.valid;
+            return *this;
         }
         Swappable<Status> valid;
     };