diff --git a/include/xrpl/protocol/Protocol.h b/include/xrpl/protocol/Protocol.h
index 6a96b2ccbe..4472da4256 100644
--- a/include/xrpl/protocol/Protocol.h
+++ b/include/xrpl/protocol/Protocol.h
@@ -307,4 +307,14 @@ constexpr std::size_t kPermissionMaxSize = 10;
 /** The maximum number of transactions that can be in a batch. */
 constexpr std::size_t kMaxBatchTxCount = 8;
 
+/** The maximum number of batch signers.
+ *
+ * A single inner transaction can require more than one signer: the inner
+ * account's authorizer plus, for some transaction types, a counterparty
+ * and/or a sponsor. Bounding the signers array at the inner-transaction
+ * count would therefore reject otherwise-valid batches. Allow up to three
+ * distinct signers per inner transaction.
+ */
+constexpr std::size_t kMaxBatchSigners = kMaxBatchTxCount * 3;
+
 }  // namespace xrpl
diff --git a/src/libxrpl/tx/transactors/system/Batch.cpp b/src/libxrpl/tx/transactors/system/Batch.cpp
index f3795ad271..3b0149cfe0 100644
--- a/src/libxrpl/tx/transactors/system/Batch.cpp
+++ b/src/libxrpl/tx/transactors/system/Batch.cpp
@@ -117,7 +117,7 @@ Batch::calculateBaseFee(ReadView const& view, STTx const& tx)
         auto const& signers = tx.getFieldArray(sfBatchSigners);
 
         // LCOV_EXCL_START
-        if (signers.size() > kMaxBatchTxCount)
+        if (signers.size() > kMaxBatchSigners)
         {
             JLOG(debugLog().error()) << "BatchTrace: Batch Signers array exceeds max entries.";
             return XRPAmount{kInitialXrp};
@@ -241,10 +241,10 @@ Batch::preflight(PreflightContext const& ctx)
     }
 
     if (ctx.tx.isFieldPresent(sfBatchSigners) &&
-        ctx.tx.getFieldArray(sfBatchSigners).size() > kMaxBatchTxCount)
+        ctx.tx.getFieldArray(sfBatchSigners).size() > kMaxBatchSigners)
     {
         JLOG(ctx.j.debug()) << "BatchTrace[" << parentBatchId << "]:"
-                            << "signers array exceeds 8 entries.";
+                            << "signers array exceeds " << kMaxBatchSigners << " entries.";
         return temARRAY_TOO_LARGE;
     }
 
@@ -433,10 +433,10 @@ Batch::preflightSigValidated(PreflightContext const& ctx)
         STArray const& signers = ctx.tx.getFieldArray(sfBatchSigners);
 
         // Check that the batch signers array is not too large.
-        if (signers.size() > kMaxBatchTxCount)
+        if (signers.size() > kMaxBatchSigners)
         {
             JLOG(ctx.j.debug()) << "BatchTrace[" << parentBatchId << "]: "
-                                << "signers array exceeds " << kMaxBatchTxCount << " entries.";
+                                << "signers array exceeds " << kMaxBatchSigners << " entries.";
             return temARRAY_TOO_LARGE;
         }
 
diff --git a/src/test/app/Batch_test.cpp b/src/test/app/Batch_test.cpp
index ad2bf2154c..88fd9b7a83 100644
--- a/src/test/app/Batch_test.cpp
+++ b/src/test/app/Batch_test.cpp
@@ -556,16 +556,16 @@ class Batch_test : public beast::unit_test::Suite
             env.close();
         }
 
-        // DEFENSIVE: temARRAY_TOO_LARGE: Batch: signers array exceeds 8
-        // entries.
+        // DEFENSIVE: temARRAY_TOO_LARGE: Batch: signers array exceeds
+        // kMaxBatchSigners entries.
         // ACTUAL: telENV_RPC_FAILED: isRawTransactionOkay()
         {
             auto const seq = env.seq(alice);
-            auto const batchFee = batch::calcBatchFee(env, 9, 2);
+            auto const batchFee = batch::calcBatchFee(env, kMaxBatchSigners + 1, 2);
             env(batch::outer(alice, seq, batchFee, tfAllOrNothing),
                 batch::Inner(pay(alice, bob, XRP(10)), seq + 1),
                 batch::Inner(pay(alice, bob, XRP(5)), seq + 2),
-                batch::Sig(bob, carol, alice, bob, carol, alice, bob, carol, alice, alice),
+                batch::Sig(std::vector<Reg>(kMaxBatchSigners + 1, bob)),
                 Ter(telENV_RPC_FAILED));
             env.close();
         }
@@ -1530,7 +1530,8 @@ class Batch_test : public beast::unit_test::Suite
             });
         }
 
-        // telENV_RPC_FAILED: Batch: signers array exceeds 8 entries.
+        // telENV_RPC_FAILED: Batch: signers array exceeds kMaxBatchSigners
+        // entries.
         {
             test::jtx::Env env{*this, features};
 
@@ -1540,16 +1541,17 @@ class Batch_test : public beast::unit_test::Suite
             env.close();
 
             auto const aliceSeq = env.seq(alice);
-            auto const batchFee = batch::calcBatchFee(env, 9, 2);
+            auto const batchFee = batch::calcBatchFee(env, kMaxBatchSigners + 1, 2);
             env(batch::outer(alice, aliceSeq, batchFee, tfAllOrNothing),
                 batch::Inner(pay(alice, bob, XRP(10)), aliceSeq + 1),
                 batch::Inner(pay(alice, bob, XRP(5)), aliceSeq + 2),
-                batch::Sig(bob, bob, bob, bob, bob, bob, bob, bob, bob, bob),
+                batch::Sig(std::vector<Reg>(kMaxBatchSigners + 1, bob)),
                 Ter(telENV_RPC_FAILED));
             env.close();
         }
 
-        // temARRAY_TOO_LARGE: Batch preflight: signers array exceeds 8 entries.
+        // temARRAY_TOO_LARGE: Batch preflight: signers array exceeds
+        // kMaxBatchSigners entries.
         {
             test::jtx::Env env{*this, features};
 
@@ -1558,13 +1560,13 @@ class Batch_test : public beast::unit_test::Suite
             env.fund(XRP(10000), alice, bob);
             env.close();
 
-            auto const batchFee = batch::calcBatchFee(env, 0, 9);
+            auto const batchFee = batch::calcBatchFee(env, kMaxBatchSigners + 1, 2);
             auto const aliceSeq = env.seq(alice);
             auto jt = env.jtnofill(
                 batch::outer(alice, aliceSeq, batchFee, tfAllOrNothing),
                 batch::Inner(pay(alice, bob, XRP(10)), aliceSeq + 1),
                 batch::Inner(pay(alice, bob, XRP(5)), aliceSeq + 2),
-                batch::Sig(bob, bob, bob, bob, bob, bob, bob, bob, bob, bob));
+                batch::Sig(std::vector<Reg>(kMaxBatchSigners + 1, bob)));
 
             env.app().getOpenLedger().modify([&](OpenView& view, beast::Journal j) {
                 auto const result = xrpl::apply(env.app(), view, *jt.stx, TapNone, j);
@@ -5424,7 +5426,7 @@ class Batch_test : public beast::unit_test::Suite
                 batch::outer(alice, seq, batchFee, tfAllOrNothing),
                 batch::Inner(pay(alice, bob, XRP(10)), seq + 1),
                 batch::Inner(pay(alice, bob, XRP(5)), seq + 2),
-                batch::Sig(bob, carol, alice, bob, carol, alice, bob, carol, alice, alice));
+                batch::Sig(std::vector<Reg>(kMaxBatchSigners + 1, bob)));
             XRPAmount const txBaseFee = getBaseFee(jtx);
             BEAST_EXPECT(txBaseFee == XRPAmount(kInitialXrp));
         }