diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0efd978..958e62b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -109,6 +109,9 @@ if (SIMMETRIX)
     if(${SIM_MAJOR_VER} LESS 18)
       target_compile_definitions(pumgen PUBLIC BEFORE_SIM_18)
     endif()
+    if(${SIM_MAJOR_VER} LESS 2024)
+      target_compile_definitions(pumgen PUBLIC BEFORE_SIM_2024)
+    endif()
     target_include_directories(pumgen PUBLIC ${SIMMETRIX_INCLUDE_DIR})
     target_link_libraries(pumgen PUBLIC ${SIMMETRIX_LIBRARIES})
 endif()
diff --git a/src/input/SimModSuite.h b/src/input/SimModSuite.h
index 416448a..e74907a 100644
--- a/src/input/SimModSuite.h
+++ b/src/input/SimModSuite.h
@@ -62,9 +62,6 @@
 #include <string>
 #include <vector>
 
-// forward declare
-pAManager SModel_attManager(pModel model);
-
 /**
  * @todo Currently it is not supported to create more than one instance
  *  of this class
@@ -159,7 +156,11 @@ class SimModSuite : public FullStorageMeshData {
     logInfo(PMU_rank()) << "Starting the volume mesher";
     pVolumeMesher volumeMesher = VolumeMesher_new(meshCase, m_simMesh);
     if (xmlFile != nullptr) {
+#ifdef BEFORE_SIM_2024
       VolumeMesher_setSmoothing(volumeMesher, MeshAtt.volumeSmoothingLevel);
+#else
+      VolumeMesher_setSmoothLevel(volumeMesher, MeshAtt.volumeSmoothingLevel);
+#endif
       VolumeMesher_setSmoothType(volumeMesher, static_cast<int>(MeshAtt.volumeSmoothingType));
       VolumeMesher_setOptimization(volumeMesher, MeshAtt.VolumeMesherOptimization);
     }
@@ -448,8 +449,11 @@ class SimModSuite : public FullStorageMeshData {
   void extractCases(pGModel m_model, pACase& meshCase, const char* meshCaseName,
                     pACase& analysisCase, const char* analysisCaseName) {
     logInfo(PMU_rank()) << "Extracting cases";
-    pAManager attMngr = SModel_attManager(m_model);
-
+#ifdef BEFORE_SIM_2024
+    pAManager attMngr = GM_attManager(m_model);
+#else
+    pAManager attMngr = GM_attManager(m_model, false);
+#endif
     MeshingOptions meshingOptions;
     meshCase = MS_newMeshCase(m_model);
 
diff --git a/src/input/SimModSuiteApf.h b/src/input/SimModSuiteApf.h
index ad07f30..88ed5f2 100644
--- a/src/input/SimModSuiteApf.h
+++ b/src/input/SimModSuiteApf.h
@@ -64,9 +64,6 @@
 #include <string>
 #include <vector>
 
-// forward declare
-pAManager SModel_attManager(pModel model);
-
 /**
  * @todo Currently it is not supported to create more than one instance
  *  of this class
@@ -330,7 +327,12 @@ class SimModSuiteApf : public ApfMeshInput {
   void extractCases(pGModel m_model, pACase& meshCase, const char* meshCaseName,
                     pACase& analysisCase, const char* analysisCaseName) {
     logInfo(PMU_rank()) << "Extracting cases";
-    pAManager attMngr = SModel_attManager(m_model);
+
+#ifdef BEFORE_SIM_2024
+    pAManager attMngr = GM_attManager(m_model);
+#else
+    pAManager attMngr = GM_attManager(m_model, false);
+#endif
 
     MeshingOptions meshingOptions;
     meshCase = MS_newMeshCase(m_model);