diff --git a/flang/lib/Optimizer/CodeGen/CMakeLists.txt b/flang/lib/Optimizer/CodeGen/CMakeLists.txt
--- a/flang/lib/Optimizer/CodeGen/CMakeLists.txt
+++ b/flang/lib/Optimizer/CodeGen/CMakeLists.txt
@@ -17,6 +17,8 @@
   FIRBuilder
   FIRDialect
   FIRSupport
+  MLIRComplexToLLVM
+  MLIRComplexToStandard
   MLIRMathToFuncs
   MLIRMathToLLVM
   MLIRMathToLibm