diff --git a/build/cmake/functions.cmake b/build/cmake/functions.cmake
index bc012a14b6..9b493593ad 100644
--- a/build/cmake/functions.cmake
+++ b/build/cmake/functions.cmake
@@ -271,7 +271,7 @@ function(wx_set_target_properties target_name)
     endif()
 
     # Set common compile definitions
-    target_compile_definitions(${target_name} PRIVATE WXBUILDING _LIB)
+    target_compile_definitions(${target_name} PRIVATE WXBUILDING)
     if(target_name_short STREQUAL "mono" AND wxUSE_GUI)
         target_compile_definitions(${target_name} PRIVATE wxUSE_GUI=1 wxUSE_BASE=1)
     elseif(wxTARGET_IS_PLUGIN)
@@ -350,9 +350,9 @@ function(wx_set_target_properties target_name)
     if(wxBUILD_SHARED)
         string(TOUPPER ${target_name_short} target_name_upper)
         if(target_name_short STREQUAL "mono")
-            target_compile_definitions(${target_name} PRIVATE DLL_EXPORTS WXMAKINGDLL)
+            target_compile_definitions(${target_name} PRIVATE WXMAKINGDLL)
         elseif(NOT wxTARGET_IS_PLUGIN)
-            target_compile_definitions(${target_name} PRIVATE DLL_EXPORTS WXMAKINGDLL_${target_name_upper})
+            target_compile_definitions(${target_name} PRIVATE WXMAKINGDLL_${target_name_upper})
         endif()
         target_compile_definitions(${target_name} INTERFACE WXUSINGDLL)
     endif()
diff --git a/build/cmake/lib/CMakeLists.txt b/build/cmake/lib/CMakeLists.txt
index 570e2b581f..41471190fe 100644
--- a/build/cmake/lib/CMakeLists.txt
+++ b/build/cmake/lib/CMakeLists.txt
@@ -75,7 +75,6 @@ endforeach()
 
 if(wxBUILD_MONOLITHIC)
     # Create monolithic library target
-    list(LENGTH wxMONO_SRC_FILES src_file_count)
     wx_add_library(wxmono ${wxMONO_SRC_FILES})
     foreach(vis PRIVATE PUBLIC)
         if(wxMONO_LIBS_${vis})
diff --git a/build/cmake/lib/base/CMakeLists.txt b/build/cmake/lib/base/CMakeLists.txt
index 9f4a472813..dc512f23e2 100644
--- a/build/cmake/lib/base/CMakeLists.txt
+++ b/build/cmake/lib/base/CMakeLists.txt
@@ -26,10 +26,6 @@ endif()
 
 wx_add_library(wxbase IS_BASE ${BASE_FILES})
 
-if(NOT wxBUILD_MONOLITHIC)
-    wx_lib_compile_definitions(wxbase PRIVATE wxUSE_BASE=1)
-endif()
-
 if(wxUSE_ZLIB)
     wx_lib_include_directories(wxbase ${ZLIB_INCLUDE_DIRS})
     wx_lib_link_libraries(wxbase PRIVATE ${ZLIB_LIBRARIES})