diff --git a/p4_pdpi/p4info_union_lib.cc b/p4_pdpi/p4info_union_lib.cc
index 2496f45b..d381189c 100644
--- a/p4_pdpi/p4info_union_lib.cc
+++ b/p4_pdpi/p4info_union_lib.cc
@@ -14,6 +14,7 @@
 
 #include "p4_pdpi/p4info_union_lib.h"
 
+#include <algorithm>
 #include <string>
 
 #include "absl/algorithm/container.h"
@@ -120,7 +121,8 @@ absl::Status AssertTableCompatibility(const p4::config::v1::Table& table1,
           DiffMessages(table1, table2,
                        /*ignored_fields=*/
                        {"preamble", "match_fields", "action_refs",
-                        "direct_resource_ids", "other_properties"});
+                        "direct_resource_ids", "other_properties",
+			"size"});
       diff_result.has_value()) {
     return absl::InvalidArgumentError(absl::StrCat(
         "tables were incompatible. Relevant differences: ", *diff_result));
@@ -282,6 +284,9 @@ absl::Status UnionFirstFieldIntoSecondAssertingIdenticalId(
              "incompatible: ",
              __func__, GetId(table));
 
+  // Use the max size of any table.
+  unioned_table.set_size(std::max(unioned_table.size(), table.size()));
+
   // For tables, we union their repeated fields and preambles.
   RETURN_IF_ERROR(UnionFirstPreambleIntoSecondAssertingIdenticalId(
       table.preamble(), *unioned_table.mutable_preamble()));
diff --git a/sai_p4/instantiations/google/acl_pre_ingress.p4 b/sai_p4/instantiations/google/acl_pre_ingress.p4
index 681dbc40..d37c8b3d 100644
--- a/sai_p4/instantiations/google/acl_pre_ingress.p4
+++ b/sai_p4/instantiations/google/acl_pre_ingress.p4
@@ -8,6 +8,14 @@
 #include "roles.h"
 #include "minimum_guaranteed_sizes.p4"
 
+#if defined(SAI_INSTANTIATION_TOR)
+#define ACL_PRE_INGRESS_TABLE_MINIMUM_GUARANTEED_SIZE \
+  ACL_TOR_PRE_INGRESS_TABLE_MINIMUM_GUARANTEED_SIZE
+#else
+#define ACL_PRE_INGRESS_TABLE_MINIMUM_GUARANTEED_SIZE \
+  ACL_DEFAULT_PRE_INGRESS_TABLE_MINIMUM_GUARANTEED_SIZE
+#endif
+
 control acl_pre_ingress(in headers_t headers,
                    inout local_metadata_t local_metadata,
                    in standard_metadata_t standard_metadata) {
diff --git a/sai_p4/instantiations/google/fabric_border_router.p4info.pb.txt b/sai_p4/instantiations/google/fabric_border_router.p4info.pb.txt
index fa8285fd..28ffbdac 100644
--- a/sai_p4/instantiations/google/fabric_border_router.p4info.pb.txt
+++ b/sai_p4/instantiations/google/fabric_border_router.p4info.pb.txt
@@ -93,7 +93,7 @@ tables {
   }
   const_default_action_id: 21257015
   direct_resource_ids: 318767361
-  size: 255
+  size: 254
 }
 tables {
   preamble {
diff --git a/sai_p4/instantiations/google/middleblock.p4info.pb.txt b/sai_p4/instantiations/google/middleblock.p4info.pb.txt
index 20675bbd..0f92833c 100755
--- a/sai_p4/instantiations/google/middleblock.p4info.pb.txt
+++ b/sai_p4/instantiations/google/middleblock.p4info.pb.txt
@@ -93,7 +93,7 @@ tables {
   }
   const_default_action_id: 21257015
   direct_resource_ids: 318767361
-  size: 255
+  size: 254
 }
 tables {
   preamble {
diff --git a/sai_p4/instantiations/google/minimum_guaranteed_sizes.p4 b/sai_p4/instantiations/google/minimum_guaranteed_sizes.p4
index f86d964f..76e06f79 100644
--- a/sai_p4/instantiations/google/minimum_guaranteed_sizes.p4
+++ b/sai_p4/instantiations/google/minimum_guaranteed_sizes.p4
@@ -63,7 +63,8 @@
 
 #define ACL_DEFAULT_PRE_INGRESS_TABLE_MINIMUM_GUARANTEED_SIZE 254
 
-#define ACL_PRE_INGRESS_TABLE_MINIMUM_GUARANTEED_SIZE 255
+
+#define ACL_TOR_PRE_INGRESS_TABLE_MINIMUM_GUARANTEED_SIZE 127
 
 #define ACL_INGRESS_COUNTING_TABLE_MINIMUM_GUARANTEED_SIZE 255
 
diff --git a/sai_p4/instantiations/google/tor.p4info.pb.txt b/sai_p4/instantiations/google/tor.p4info.pb.txt
index 8a460041..a4613885 100644
--- a/sai_p4/instantiations/google/tor.p4info.pb.txt
+++ b/sai_p4/instantiations/google/tor.p4info.pb.txt
@@ -93,7 +93,7 @@ tables {
   }
   const_default_action_id: 21257015
   direct_resource_ids: 318767361
-  size: 255
+  size: 127
 }
 tables {
   preamble {
@@ -136,7 +136,7 @@ tables {
   }
   const_default_action_id: 21257015
   direct_resource_ids: 318767366
-  size: 255
+  size: 127
 }
 tables {
   preamble {
@@ -193,7 +193,7 @@ tables {
   }
   const_default_action_id: 21257015
   direct_resource_ids: 318767365
-  size: 255
+  size: 127
 }
 tables {
   preamble {
diff --git a/sai_p4/instantiations/google/unioned_p4info.pb.txt b/sai_p4/instantiations/google/unioned_p4info.pb.txt
index b2f1a07e..288eb8bd 100644
--- a/sai_p4/instantiations/google/unioned_p4info.pb.txt
+++ b/sai_p4/instantiations/google/unioned_p4info.pb.txt
@@ -93,7 +93,7 @@ tables {
   }
   const_default_action_id: 21257015
   direct_resource_ids: 318767361
-  size: 255
+  size: 254
 }
 tables {
   preamble {
@@ -817,7 +817,7 @@ tables {
   }
   const_default_action_id: 21257015
   direct_resource_ids: 318767366
-  size: 255
+  size: 127
 }
 tables {
   preamble {
@@ -874,7 +874,7 @@ tables {
   }
   const_default_action_id: 21257015
   direct_resource_ids: 318767365
-  size: 255
+  size: 127
 }
 tables {
   preamble {