diff --git a/BUILD b/BUILD
index 0130f55e88..80ae3e5297 100644
--- a/BUILD
+++ b/BUILD
@@ -347,7 +347,6 @@ cc_library(
         "src/google/protobuf/compiler/plugin.pb.cc",
         "src/google/protobuf/compiler/python/python_generator.cc",
         "src/google/protobuf/compiler/ruby/ruby_generator.cc",
-        "src/google/protobuf/compiler/scc.cc",
         "src/google/protobuf/compiler/subprocess.cc",
         "src/google/protobuf/compiler/zip_writer.cc",
     ],
diff --git a/src/google/protobuf/compiler/scc.cc b/src/google/protobuf/compiler/scc.cc
deleted file mode 100644
index bbdabbfc11..0000000000
--- a/src/google/protobuf/compiler/scc.cc
+++ /dev/null
@@ -1,111 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include <google/protobuf/compiler/scc.h>
-
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/descriptor.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-
-SCCAnalyzer::NodeData SCCAnalyzer::DFS(const Descriptor* descriptor) {
-  // Must not have visited already.
-  GOOGLE_DCHECK_EQ(cache_.count(descriptor), 0);
-
-  // Mark visited by inserting in map.
-  NodeData& result = cache_[descriptor];
-  // Initialize data structures.
-  result.index = result.lowlink = index_++;
-  stack_.push_back(descriptor);
-
-  // Recurse the fields / nodes in graph
-  for (int i = 0; i < descriptor->field_count(); i++) {
-    const Descriptor* child = descriptor->field(i)->message_type();
-    if (child) {
-      if (cache_.count(child) == 0) {
-        // unexplored node
-        NodeData child_data = DFS(child);
-        result.lowlink = std::min(result.lowlink, child_data.lowlink);
-      } else {
-        NodeData child_data = cache_[child];
-        if (child_data.scc == nullptr) {
-          // Still in the stack_ so we found a back edge
-          result.lowlink = std::min(result.lowlink, child_data.index);
-        }
-      }
-    }
-  }
-  if (result.index == result.lowlink) {
-    // This is the root of a strongly connected component
-    SCC* scc = CreateSCC();
-    while (true) {
-      const Descriptor* scc_desc = stack_.back();
-      scc->descriptors.push_back(scc_desc);
-      // Remove from stack
-      stack_.pop_back();
-      cache_[scc_desc].scc = scc;
-
-      if (scc_desc == descriptor) break;
-    }
-
-    // The order of descriptors is random and depends how this SCC was
-    // discovered. In-order to ensure maximum stability we sort it by name.
-    std::sort(scc->descriptors.begin(), scc->descriptors.end(),
-              [](const Descriptor* a, const Descriptor* b) {
-                return a->full_name() < b->full_name();
-              });
-    AddChildren(scc);
-  }
-  return result;
-}
-
-void SCCAnalyzer::AddChildren(SCC* scc) {
-  std::set<const SCC*> seen;
-  for (int i = 0; i < scc->descriptors.size(); i++) {
-    const Descriptor* descriptor = scc->descriptors[i];
-    for (int j = 0; j < descriptor->field_count(); j++) {
-      const Descriptor* child_msg = descriptor->field(j)->message_type();
-      if (child_msg) {
-        const SCC* child = GetSCC(child_msg);
-        if (child == scc) continue;
-        if (seen.insert(child).second) {
-          scc->children.push_back(child);
-        }
-      }
-    }
-  }
-}
-
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google