diff --git a/onnxruntime/core/session/onnxruntime_c_api.cc b/onnxruntime/core/session/onnxruntime_c_api.cc
index f2a241db27..53af75a2c6 100644
--- a/onnxruntime/core/session/onnxruntime_c_api.cc
+++ b/onnxruntime/core/session/onnxruntime_c_api.cc
@@ -2728,6 +2728,13 @@ static constexpr OrtApi ort_api_1_to_16 = {
     &OrtApis::GetBuildInfoString};
 // End of Version 15 - DO NOT MODIFY ABOVE (see above text for more information)
 
+// OrtApiBase can never change as there is no way to know what version of OrtApiBase is returned by OrtGetApiBase.
+static_assert(sizeof(OrtApiBase) == sizeof(void*) * 2, "New methods can't be added to OrtApiBase as it is not versioned");
+static_assert(offsetof(OrtApiBase, GetApi) / sizeof(void*) == 0, "These functions cannot be reordered");
+static_assert(offsetof(OrtApiBase, GetVersionString) / sizeof(void*) == 1, "These functions cannot be reordered");
+static_assert(std::is_same_v<decltype(OrtApiBase::GetApi), const OrtApi*(ORT_API_CALL*)(uint32_t)NO_EXCEPTION>, "This function's signature can never change");
+static_assert(std::is_same_v<decltype(OrtApiBase::GetVersionString), const char*(ORT_API_CALL*)(void)NO_EXCEPTION>, "This function's signature can never change");
+
 // Asserts to do a some checks to ensure older Versions of the OrtApi never change (will detect an addition or deletion but not if they cancel out each other)
 // If any of these asserts hit, read the above 'Rules on how to add a new Ort API version'
 static_assert(offsetof(OrtApi, ReleaseCustomOpDomain) / sizeof(void*) == 101, "Size of version 1 API cannot change");