diff --git a/simgear/sky/sky.cxx b/simgear/sky/sky.cxx
index 36c3c257..5cde898f 100644
--- a/simgear/sky/sky.cxx
+++ b/simgear/sky/sky.cxx
@@ -248,8 +248,8 @@ void SGSky::postDraw( float alt ) {
 }
 
  
-void SGSky::add_cloud_layer( double span, double asl,
-			     double thickness, double transition,
+void SGSky::add_cloud_layer( double asl, double thickness,
+			     double transition, double span,
 			     ssgSimpleState *state ) {
     SGCloudLayer *layer = new SGCloudLayer;
     layer->build( span, asl, thickness, transition, state );
@@ -273,19 +273,19 @@ void SGSky::add_cloud_layer( double span, double asl,
 }
 
 
-void SGSky::add_cloud_layer( double span, double asl,
-			     double thickness, double transition,
+void SGSky::add_cloud_layer( double asl, double thickness,
+			     double transition, double span,
 			     const string &tex_path ) {
     ssgSimpleState *state = SGCloudMakeState( tex_path );
-    add_cloud_layer( span, asl, thickness, transition, state );
+    add_cloud_layer( asl, thickness, transition, span, state );
 }
 
 
-void SGSky::add_cloud_layer( double span, double asl,
-			     double thickness, double transition,
+void SGSky::add_cloud_layer( double asl, double thickness,
+			     double transition, double span,
 			     SGCloudType type ) {
     if ( type > 0 && type < SG_MAX_CLOUD_TYPES ) {
-	add_cloud_layer( span, asl, thickness, transition, cloud_mats[type] );
+	add_cloud_layer( asl, thickness, transition, span, cloud_mats[type] );
     }
 }
 
diff --git a/simgear/sky/sky.hxx b/simgear/sky/sky.hxx
index 95665fd7..4190508b 100644
--- a/simgear/sky/sky.hxx
+++ b/simgear/sky/sky.hxx
@@ -153,14 +153,14 @@ public:
     }
 
     // add a cloud layer (above sea level in meters)
-    void add_cloud_layer( double span, double asl, 
-			  double thickness, double transition,
+    void add_cloud_layer( double asl, double thickness,
+			  double transition, double span,
 			  SGCloudType type );
-    void add_cloud_layer( double span, double asl,
-			  double thickness, double transition,
+    void add_cloud_layer( double asl, double thickness,
+			  double transition, double span,
 			  const string &tex_path );
-    void add_cloud_layer( double span, double asl,
-			  double thickness, double transition,
+    void add_cloud_layer( double asl, double thickness,
+			  double transition, double span,
 			  ssgSimpleState *state );
 
     inline int get_num_layers() const { return cloud_layers.size(); }