diff --git a/changes/bug11787 b/changes/bug11787
new file mode 100644
index 0000000000..014662d921
--- /dev/null
+++ b/changes/bug11787
@@ -0,0 +1,5 @@
+  o Minor bugfixes (directory bandwidth performance):
+    - Don't flush the zlib buffer aggressively when compressing
+      directory information for clients.  This should save about 7% of
+      the bandwidth currently used for compressed descriptors and
+      microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
diff --git a/src/common/torgzip.c b/src/common/torgzip.c
index 15451ee30d..239cab9cac 100644
--- a/src/common/torgzip.c
+++ b/src/common/torgzip.c
@@ -472,7 +472,7 @@ tor_zlib_process(tor_zlib_state_t *state,
   state->stream.avail_out = (unsigned int)*out_len;
 
   if (state->compress) {
-    err = deflate(&state->stream, finish ? Z_FINISH : Z_SYNC_FLUSH);
+    err = deflate(&state->stream, finish ? Z_FINISH : Z_NO_FLUSH);
   } else {
     err = inflate(&state->stream, finish ? Z_FINISH : Z_SYNC_FLUSH);
   }