diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1625ee5..01a433f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -142,9 +142,11 @@ else()
 endif()
 
 foreach(F IN LISTS TGC_SOURCES)
-    string(REGEX REPLACE  ".*/([^/]*)\.cpp"  "\\1" CORE_NAME_LC ${F})
-    string(TOUPPER ${CORE_NAME_LC} CORE_NAME)
-    target_compile_definitions(${PROJECT_NAME} PRIVATE CORE_${CORE_NAME})
+    if (${F} MATCHES ".*/arch/([^/]*)\.cpp")
+        string(REGEX REPLACE  ".*/([^/]*)\.cpp"  "\\1" CORE_NAME_LC ${F})
+        string(TOUPPER ${CORE_NAME_LC} CORE_NAME)
+        target_compile_definitions(${PROJECT_NAME} PRIVATE CORE_${CORE_NAME})
+    endif()
 endforeach()
 
 if(WITH_LLVM)
@@ -181,9 +183,11 @@ if(TARGET scc-sysc)
     target_compile_definitions(${PROJECT_NAME} PUBLIC WITH_SYSTEMC)
     target_compile_definitions(${PROJECT_NAME} PRIVATE CORE_${CORE_NAME})
     foreach(F IN LISTS TGC_SOURCES)
-        string(REGEX REPLACE  ".*/([^/]*)\.cpp"  "\\1" CORE_NAME_LC ${F})
-        string(TOUPPER ${CORE_NAME_LC} CORE_NAME)
-        target_compile_definitions(${PROJECT_NAME} PRIVATE CORE_${CORE_NAME})
+        if (${F} MATCHES ".*/arch/([^/]*)\.cpp")
+            string(REGEX REPLACE  ".*/([^/]*)\.cpp"  "\\1" CORE_NAME_LC ${F})
+            string(TOUPPER ${CORE_NAME_LC} CORE_NAME)
+            target_compile_definitions(${PROJECT_NAME} PRIVATE CORE_${CORE_NAME})
+        endif()
     endforeach()
     target_link_libraries(${PROJECT_NAME} PUBLIC dbt-rise-tgc scc-sysc)
     if(WITH_LLVM)