diff --git a/src/celengine/planetgrid.cpp b/src/celengine/planetgrid.cpp
index 0d2ffb2ae7..db83aaaa65 100644
--- a/src/celengine/planetgrid.cpp
+++ b/src/celengine/planetgrid.cpp
@@ -26,8 +26,6 @@ using namespace celmath;
 using namespace celestia;
 using celestia::render::LineRenderer;
 
-namespace astro = celestia::astro;
-
 LineRenderer *PlanetographicGrid::latitudeRenderer = nullptr;
 LineRenderer *PlanetographicGrid::equatorRenderer = nullptr;
 LineRenderer *PlanetographicGrid::longitudeRenderer = nullptr;
diff --git a/src/celengine/render.cpp b/src/celengine/render.cpp
index eed6a2118e..12ca0ac13d 100644
--- a/src/celengine/render.cpp
+++ b/src/celengine/render.cpp
@@ -95,8 +95,6 @@ using namespace celestia::engine;
 using namespace celestia::render;
 using celestia::util::GetLogger;
 
-namespace astro = celestia::astro;
-
 #define NEAR_DIST      0.5f
 #define FAR_DIST       1.0e9f
 
diff --git a/src/celestia/celestiacore.cpp b/src/celestia/celestiacore.cpp
index 23c9139fc4..ffe2b6ee0f 100644
--- a/src/celestia/celestiacore.cpp
+++ b/src/celestia/celestiacore.cpp
@@ -84,8 +84,6 @@ using namespace celestia::engine;
 using namespace celestia::scripts;
 using namespace celestia::util;
 
-namespace astro = celestia::astro;
-
 static const int DragThreshold = 3;
 
 // Perhaps you'll want to put this stuff in configuration file.