diff --git a/lib/inflate.js b/lib/inflate.js
index b1bf1ce..42b812e 100644
--- a/lib/inflate.js
+++ b/lib/inflate.js
@@ -2,9 +2,21 @@ const b4a = require('b4a')
 const { Pointer, KeyPointer, ValuePointer, TreeNode } = require('./tree.js')
 const { DeltaOp, DeltaCohort, OP_COHORT } = require('./compression.js')
 
+const pending = new WeakMap()
+
 exports.inflate = async function inflate(ptr, config) {
   if (ptr.value) return ptr.value
+  if (pending.has(ptr)) return pending.get(ptr)
+  const promise = _inflate(ptr, config)
+  pending.set(ptr, promise)
+  try {
+    return await promise
+  } finally {
+    pending.delete(ptr)
+  }
+}
 
+async function _inflate(ptr, config) {
   const [block, context] = await Promise.all([
     ptr.context.getBlock(ptr.seq, ptr.core, config),
     ptr.context.getContext(ptr.core, config)