diff --git a/include/backend/dd/DDSimDebug.hpp b/include/backend/dd/DDSimDebug.hpp
index 5192e0a..508982b 100644
--- a/include/backend/dd/DDSimDebug.hpp
+++ b/include/backend/dd/DDSimDebug.hpp
@@ -1,13 +1,13 @@
 #pragma once
 
 #include "DDSimDiagnostics.hpp"
-#include "QuantumComputation.hpp"
 #include "backend/debug.h"
 #include "backend/diagnostics.h"
 #include "common.h"
 #include "common/parsing/AssertionParsing.hpp"
 #include "dd/Package.hpp"
-#include "operations/Operation.hpp"
+#include "ir/QuantumComputation.hpp"
+#include "ir/operations/Operation.hpp"
 
 #include <cstddef>
 #include <cstdint>
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index daa54c9..e460df1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -13,7 +13,7 @@ target_include_directories(${PROJECT_NAME} PUBLIC ${PROJECT_SOURCE_DIR}/include
                                                   ${PROJECT_BINARY_DIR}/include)
 
 # link to the MQT::Core libraries
-target_link_libraries(${PROJECT_NAME} PUBLIC MQT::CoreDD)
+target_link_libraries(${PROJECT_NAME} PUBLIC MQT::CoreDD MQT::CoreIR MQT::CoreCircuitOptimizer)
 target_link_libraries(${PROJECT_NAME} PRIVATE MQT::ProjectWarnings MQT::ProjectOptions)
 
 # add MQT alias
diff --git a/src/backend/dd/DDSimDebug.cpp b/src/backend/dd/DDSimDebug.cpp
index 798ed28..283449e 100644
--- a/src/backend/dd/DDSimDebug.cpp
+++ b/src/backend/dd/DDSimDebug.cpp
@@ -1,10 +1,10 @@
 #include "backend/dd/DDSimDebug.hpp"
 
-#include "CircuitOptimizer.hpp"
 #include "Definitions.hpp"
 #include "backend/dd/DDSimDiagnostics.hpp"
 #include "backend/debug.h"
 #include "backend/diagnostics.h"
+#include "circuit_optimizer/CircuitOptimizer.hpp"
 #include "common.h"
 #include "common/Span.hpp"
 #include "common/parsing/AssertionParsing.hpp"
@@ -13,8 +13,8 @@
 #include "dd/DDDefinitions.hpp"
 #include "dd/Operations.hpp"
 #include "dd/Package.hpp"
-#include "operations/ClassicControlledOperation.hpp"
-#include "operations/OpType.hpp"
+#include "ir/operations/ClassicControlledOperation.hpp"
+#include "ir/operations/OpType.hpp"
 
 #include <algorithm>
 #include <array>