diff --git a/simgear/props/condition.cxx b/simgear/props/condition.cxx
index 04b892e5..1da575a4 100644
--- a/simgear/props/condition.cxx
+++ b/simgear/props/condition.cxx
@@ -69,7 +69,7 @@ public:
   virtual bool test () const;
   virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const;
 private:
-  SGSharedPtr<SGCondition> _condition;
+  SGConditionRef _condition;
 };
 
 
@@ -89,7 +89,7 @@ public:
   virtual void addCondition (SGCondition * condition);
   virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const;
 private:
-  std::vector<SGSharedPtr<SGCondition> > _conditions;
+  std::vector<SGConditionRef> _conditions;
 };
 
 
@@ -109,7 +109,7 @@ public:
   virtual void addCondition (SGCondition * condition);
   virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const;
 private:
-  std::vector<SGSharedPtr<SGCondition> > _conditions;
+  std::vector<SGConditionRef> _conditions;
 };
 
 
diff --git a/simgear/props/condition.hxx b/simgear/props/condition.hxx
index 128cdfaf..4341c239 100644
--- a/simgear/props/condition.hxx
+++ b/simgear/props/condition.hxx
@@ -38,6 +38,8 @@ public:
   virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const { }
 };
 
+typedef SGSharedPtr<SGCondition> SGConditionRef;
+
 
 /**
  * Base class for a conditional components.
@@ -56,7 +58,7 @@ public:
   virtual const SGCondition * getCondition () const { return _condition; }
   virtual bool test () const;
 private:
-  SGSharedPtr<SGCondition> _condition;
+  SGConditionRef _condition;
 };