diff --git a/src/BuildTiles/Main/tgconstruct_poly.cxx b/src/BuildTiles/Main/tgconstruct_poly.cxx
index 967a373a..808c1473 100644
--- a/src/BuildTiles/Main/tgconstruct_poly.cxx
+++ b/src/BuildTiles/Main/tgconstruct_poly.cxx
@@ -108,6 +108,7 @@ int TGConstruct::LoadLandclassPolys( void ) {
                     }
                 }
 
+                gzclose( fp );
                 SG_LOG(SG_GENERAL, SG_DEBUG, " Loaded " << p.file());
             }
         } // of directory file children