diff --git a/src/config.hpp b/src/config.hpp
index 8d8a4be..3f3a544 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -20,6 +20,11 @@ namespace CosmoTool
    * Coordinate type (should be a 3-array).
    */
   typedef double Coordinates[NUMDIMS];
+
+  /* 
+   * Single precision coordinates.
+   */
+  typedef float FCoordinates[NUMDIMS];
   
   /**
    * This function is used whenever one needs a general