diff --git a/include/vcpkg/vcpkgpaths.h b/include/vcpkg/vcpkgpaths.h
index 643baf57e4..505015a53b 100644
--- a/include/vcpkg/vcpkgpaths.h
+++ b/include/vcpkg/vcpkgpaths.h
@@ -77,6 +77,7 @@ namespace vcpkg
         const std::vector<std::string> get_available_triplets_names() const;
         const std::vector<TripletFile>& get_available_triplets() const;
         const std::map<std::string, std::string>& get_cmake_script_hashes() const;
+        StringView get_ports_cmake_hash() const;
         const fs::path get_triplet_file_path(Triplet triplet) const;
 
         fs::path original_cwd;
diff --git a/src/vcpkg/build.cpp b/src/vcpkg/build.cpp
index 0b5ae8420d..5b1374b23f 100644
--- a/src/vcpkg/build.cpp
+++ b/src/vcpkg/build.cpp
@@ -1043,6 +1043,7 @@ namespace vcpkg::Build
             }
         }
 
+        abi_tag_entries.emplace_back("ports.cmake", paths.get_ports_cmake_hash().to_string());
         abi_tag_entries.emplace_back("post_build_checks", "2");
         std::vector<std::string> sorted_feature_list = action.feature_list;
         Util::sort(sorted_feature_list);
diff --git a/src/vcpkg/vcpkgpaths.cpp b/src/vcpkg/vcpkgpaths.cpp
index b9f1f3f9cd..c0c5b5b84f 100644
--- a/src/vcpkg/vcpkgpaths.cpp
+++ b/src/vcpkg/vcpkgpaths.cpp
@@ -209,6 +209,7 @@ namespace vcpkg
             Lazy<std::vector<VcpkgPaths::TripletFile>> available_triplets;
             Lazy<std::vector<Toolset>> toolsets;
             Lazy<std::map<std::string, std::string>> cmake_script_hashes;
+            Lazy<std::string> ports_cmake_hash;
 
             Files::Filesystem* fs_ptr;
 
@@ -460,6 +461,13 @@ If you wish to silence this error and use classic mode, you can:
         });
     }
 
+    StringView VcpkgPaths::get_ports_cmake_hash() const
+    {
+        return m_pimpl->ports_cmake_hash.get_lazy([this]() -> std::string {
+            return Hash::get_file_hash(VCPKG_LINE_INFO, get_filesystem(), ports_cmake, Hash::Algorithm::Sha1);
+        });
+    }
+
     const fs::path VcpkgPaths::get_triplet_file_path(Triplet triplet) const
     {
         return m_pimpl->m_triplets_cache.get_lazy(