diff --git a/src/clp_ffi_js/ir/StreamReader.cpp b/src/clp_ffi_js/ir/StreamReader.cpp
index 98e5cb84..f41d79ff 100644
--- a/src/clp_ffi_js/ir/StreamReader.cpp
+++ b/src/clp_ffi_js/ir/StreamReader.cpp
@@ -1,6 +1,5 @@
 #include "StreamReader.hpp"
 
-#include <algorithm>
 #include <cstddef>
 #include <cstdint>
 #include <format>
@@ -167,29 +166,27 @@ auto StreamReader::create(DataArrayTsType const& data_array, ReaderOptions const
     // Validate the stream's version
     auto pos = zstd_decompressor->get_pos();
     auto const version{get_version(*zstd_decompressor)};
-    if (std::ranges::find(cUnstructuredIrVersions, version) != cUnstructuredIrVersions.end()) {
-        try {
+    auto const version_validation_result{clp::ffi::ir_stream::validate_protocol_version(version)};
+
+    try {
+        if (clp::ffi::ir_stream::IRProtocolErrorCode::Supported == version_validation_result) {
+            zstd_decompressor->seek_from_begin(0);
+            return std::make_unique<StructuredIrStreamReader>(StructuredIrStreamReader::create(
+                    std::move(zstd_decompressor),
+                    std::move(data_buffer),
+                    reader_options
+            ));
+        }
+        if (clp::ffi::ir_stream::IRProtocolErrorCode::BackwardCompatible
+            == version_validation_result)
+        {
             zstd_decompressor->seek_from_begin(pos);
-        } catch (ZstdDecompressor::OperationFailed& e) {
-            throw ClpFfiJsException{
-                    clp::ErrorCode::ErrorCode_Failure,
-                    __FILENAME__,
-                    __LINE__,
-                    std::format("Unable to rewind zstd decompressor: {}", e.what())
-            };
+            return std::make_unique<UnstructuredIrStreamReader>(UnstructuredIrStreamReader::create(
+                    std::move(zstd_decompressor),
+                    std::move(data_buffer)
+            ));
         }
-        return std::make_unique<UnstructuredIrStreamReader>(UnstructuredIrStreamReader::create(
-                std::move(zstd_decompressor),
-                std::move(data_buffer)
-        ));
-    }
-    //    if (clp::ffi::ir_stream::IRProtocolErrorCode_Supported
-    //               == clp::ffi::ir_stream::validate_protocol_version(version))
-    //    {
-    // FIXME: wait for https://github.com/y-scope/clp/pull/573
-    try {
-        zstd_decompressor->seek_from_begin(0);
-    } catch (ZstdDecompressor::OperationFailed& e) {
+    } catch (ZstdDecompressor::OperationFailed const& e) {
         throw ClpFfiJsException{
                 clp::ErrorCode::ErrorCode_Failure,
                 __FILENAME__,
@@ -197,18 +194,12 @@ auto StreamReader::create(DataArrayTsType const& data_array, ReaderOptions const
                 std::format("Unable to rewind zstd decompressor: {}", e.what())
         };
     }
-    return std::make_unique<StructuredIrStreamReader>(StructuredIrStreamReader::create(
-            std::move(zstd_decompressor),
-            std::move(data_buffer),
-            reader_options
-    ));
-    //    }
-
-    //    throw ClpFfiJsException{
-    //            clp::ErrorCode::ErrorCode_Unsupported,
-    //            __FILENAME__,
-    //            __LINE__,
-    //            std::format("Unable to create reader for IR stream with version {}.", version)
-    //    };
+
+    throw ClpFfiJsException{
+            clp::ErrorCode::ErrorCode_Unsupported,
+            __FILENAME__,
+            __LINE__,
+            std::format("Unable to create reader for IR stream with version {}.", version)
+    };
 }
 }  // namespace clp_ffi_js::ir
diff --git a/src/clp_ffi_js/ir/StreamReader.hpp b/src/clp_ffi_js/ir/StreamReader.hpp
index 111b110f..51b1e23a 100644
--- a/src/clp_ffi_js/ir/StreamReader.hpp
+++ b/src/clp_ffi_js/ir/StreamReader.hpp
@@ -1,10 +1,8 @@
 #ifndef CLP_FFI_JS_IR_STREAMREADER_HPP
 #define CLP_FFI_JS_IR_STREAMREADER_HPP
 
-#include <array>
 #include <cstddef>
 #include <memory>
-#include <string_view>
 
 #include <clp/streaming_compression/zstd/Decompressor.hpp>
 #include <emscripten/val.h>
@@ -19,9 +17,6 @@ EMSCRIPTEN_DECLARE_VAL_TYPE(ReaderOptions);
 EMSCRIPTEN_DECLARE_VAL_TYPE(DecodedResultsTsType);
 EMSCRIPTEN_DECLARE_VAL_TYPE(FilteredLogEventMapTsType);
 
-constexpr std::array<std::string_view, 6> cUnstructuredIrVersions
-        = {"v0.0.2", "v0.0.1", "v0.0.0", "0.0.2", "0.0.1", "0.0.0"};
-
 /**
  * Class to deserialize and decode Zstandard-compressed CLP IR streams as well as format decoded
  * log events.