diff --git a/src/NMEA_data.h b/src/NMEA_data.h
index 5749d85..72ad58a 100644
--- a/src/NMEA_data.h
+++ b/src/NMEA_data.h
@@ -28,7 +28,7 @@
   hit, and closer than needed for navigation, so floats can be used to save a
   little storage.
  **************************************************************************/
-typedef double
+typedef single
     nmea_float_t; ///< the type of variables to use for floating point
 
 /**************************************************************************/