diff --git a/CHANGELOG.md b/CHANGELOG.md
index d7c08508e..8ccf0a700 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 2.37.0
+
+* Speed up tile-join overzooming and make it use less memory, by not including empty child tiles in the enumeration
+
 # 2.36.0
 
 * Make tile-join distrust the source tilesets' metadata maxzoom and minzoom
diff --git a/clip.cpp b/clip.cpp
index c6793af50..512ab2fd5 100644
--- a/clip.cpp
+++ b/clip.cpp
@@ -754,7 +754,7 @@ static std::vector<std::pair<double, double>> clip_poly1(std::vector<std::pair<d
 
 std::string overzoom(std::string s, int oz, int ox, int oy, int nz, int nx, int ny,
 		     int detail, int buffer, std::set<std::string> const &keep, bool do_compress,
-		     std::vector<std::pair<unsigned, unsigned>> *child_tiles) {
+		     std::vector<std::pair<unsigned, unsigned>> *next_overzoomed_tiles) {
 	mvt_tile tile;
 
 	try {
@@ -768,12 +768,12 @@ std::string overzoom(std::string s, int oz, int ox, int oy, int nz, int nx, int
 		exit(EXIT_PROTOBUF);
 	}
 
-	return overzoom(tile, oz, ox, oy, nz, nx, ny, detail, buffer, keep, do_compress, child_tiles);
+	return overzoom(tile, oz, ox, oy, nz, nx, ny, detail, buffer, keep, do_compress, next_overzoomed_tiles);
 }
 
 std::string overzoom(mvt_tile tile, int oz, int ox, int oy, int nz, int nx, int ny,
 		     int detail, int buffer, std::set<std::string> const &keep, bool do_compress,
-		     std::vector<std::pair<unsigned, unsigned>> *child_tiles) {
+		     std::vector<std::pair<unsigned, unsigned>> *next_overzoomed_tiles) {
 	mvt_tile outtile;
 
 	for (auto const &layer : tile.layers) {
@@ -892,7 +892,7 @@ std::string overzoom(mvt_tile tile, int oz, int ox, int oy, int nz, int nx, int
 		}
 	}
 
-	if (child_tiles != NULL) {
+	if (next_overzoomed_tiles != NULL) {
 		// will any child tiles have features in them?
 		// find out recursively from the tile we just made.
 		//
@@ -907,7 +907,7 @@ std::string overzoom(mvt_tile tile, int oz, int ox, int oy, int nz, int nx, int
 								     nz + 1, nx * 2 + x, ny * 2 + y,
 								     detail, buffer, keep, false, NULL);
 					if (child.size() > 0) {
-						child_tiles->emplace_back(nx * 2 + x, ny * 2 + y);
+						next_overzoomed_tiles->emplace_back(nx * 2 + x, ny * 2 + y);
 					}
 				}
 			}
diff --git a/geometry.hpp b/geometry.hpp
index 8bb713064..1cbaa8ef1 100644
--- a/geometry.hpp
+++ b/geometry.hpp
@@ -100,10 +100,10 @@ double distance_from_line(long long point_x, long long point_y, long long segA_x
 
 std::string overzoom(mvt_tile tile, int oz, int ox, int oy, int nz, int nx, int ny,
 		     int detail, int buffer, std::set<std::string> const &keep, bool do_compress,
-		     std::vector<std::pair<unsigned, unsigned>> *child_tiles);
+		     std::vector<std::pair<unsigned, unsigned>> *next_overzoomed_tiles);
 
 std::string overzoom(std::string s, int oz, int ox, int oy, int nz, int nx, int ny,
 		     int detail, int buffer, std::set<std::string> const &keep, bool do_compress,
-		     std::vector<std::pair<unsigned, unsigned>> *child_tiles);
+		     std::vector<std::pair<unsigned, unsigned>> *next_overzoomed_tiles);
 
 #endif
diff --git a/tile-join.cpp b/tile-join.cpp
index 61e56bee5..6e2f93199 100644
--- a/tile-join.cpp
+++ b/tile-join.cpp
@@ -659,7 +659,7 @@ struct tileset_reader {
 				}
 			}
 		} else {
-			overzoomed_tiles = next_overzoomed_tiles;
+			overzoomed_tiles = std::move(next_overzoomed_tiles);
 			next_overzoomed_tiles.clear();
 		}
 
diff --git a/version.hpp b/version.hpp
index 922d5ce74..5cd56cb78 100644
--- a/version.hpp
+++ b/version.hpp
@@ -1,6 +1,6 @@
 #ifndef VERSION_HPP
 #define VERSION_HPP
 
-#define VERSION "v2.36.0"
+#define VERSION "v2.37.0"
 
 #endif