diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59fdd286..899e5ce4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.11.6
+
+* Reduce the size of critical data structures to reduce dynamic memory use
+
 ## 1.11.5
 
 * Let zoom level 0 have just as much extent and buffer as any other zoom
diff --git a/geometry.hpp b/geometry.hpp
index 0d2b3780..35c1399a 100644
--- a/geometry.hpp
+++ b/geometry.hpp
@@ -11,10 +11,13 @@
 #define VT_NUMBER 2
 #define VT_BOOLEAN 7
 
+// The bitfield is to make sizeof(draw) be 16 instead of 24
+// at the cost, apparently, of a 0.7% increase in running time
+// for packing and unpacking.
 struct draw {
-	long long x;
-	long long y;
+	long long x : 40;
 	signed char op;
+	long long y : 40;
 	signed char necessary;
 
 	draw(int nop, long long nx, long long ny) {
diff --git a/version.hpp b/version.hpp
index d533879d..8a29be80 100644
--- a/version.hpp
+++ b/version.hpp
@@ -1 +1 @@
-#define VERSION "tippecanoe v1.11.5\n"
+#define VERSION "tippecanoe v1.11.6\n"