diff --git a/clang-tools-extra/clangd/refactor/tweaks/CMakeLists.txt b/clang-tools-extra/clangd/refactor/tweaks/CMakeLists.txt
--- a/clang-tools-extra/clangd/refactor/tweaks/CMakeLists.txt
+++ b/clang-tools-extra/clangd/refactor/tweaks/CMakeLists.txt
@@ -21,6 +21,7 @@
   ExpandMacro.cpp
   ExtractFunction.cpp
   ExtractVariable.cpp
+  ImplementAbstract.cpp
   ObjCLocalizeStringLiteral.cpp
   PopulateSwitch.cpp
   RawStringLiteral.cpp
diff --git a/clang-tools-extra/clangd/unittests/CMakeLists.txt b/clang-tools-extra/clangd/unittests/CMakeLists.txt
--- a/clang-tools-extra/clangd/unittests/CMakeLists.txt
+++ b/clang-tools-extra/clangd/unittests/CMakeLists.txt
@@ -117,6 +117,7 @@
   tweaks/ExpandMacroTests.cpp
   tweaks/ExtractFunctionTests.cpp
   tweaks/ExtractVariableTests.cpp
+  tweaks/ImplementAbstractTests.cpp
   tweaks/ObjCLocalizeStringLiteralTests.cpp
   tweaks/PopulateSwitchTests.cpp
   tweaks/RawStringLiteralTests.cpp