diff --git a/inference/Factor.h b/inference/Factor.h
index 19b981d4e..3d15f02e4 100644
--- a/inference/Factor.h
+++ b/inference/Factor.h
@@ -18,9 +18,6 @@
 
 namespace gtsam {
 
-	/** A map from key to dimension, useful in various contexts */
-  typedef SymbolMap<int> Dimensions;
-	
   /** 
    * A simple factor class to use in a factor graph.
    *
diff --git a/linear/GaussianFactor.h b/linear/GaussianFactor.h
index 0c5050c5c..b242dd368 100644
--- a/linear/GaussianFactor.h
+++ b/linear/GaussianFactor.h
@@ -28,6 +28,9 @@ namespace gtsam {
 
 	class Ordering;
 
+	/** A map from key to dimension, useful in various contexts */
+  typedef SymbolMap<int> Dimensions;
+
 /**
  * Base Class for a linear factor.
  * GaussianFactor is non-mutable (all methods const!).
@@ -164,7 +167,6 @@ public:
 		return (++(As_.begin()))->first;
 	}
 
-
 	/**
 	 * Find all variables and their dimensions
 	 * @return The set of all variable/dimension pairs