diff --git a/build/cmake/lib/webview/CMakeLists.txt b/build/cmake/lib/webview/CMakeLists.txt
index dc9850fa27..721a215bac 100644
--- a/build/cmake/lib/webview/CMakeLists.txt
+++ b/build/cmake/lib/webview/CMakeLists.txt
@@ -26,7 +26,11 @@ endif()
 wx_add_library(wxwebview ${WEBVIEW_FILES})
 
 if(WXGTK AND wxUSE_WEBVIEW_WEBKIT2)
-    set(WX_WEB_EXTENSIONS_DIRECTORY "lib/wx/${wxMAJOR_VERSION}.${wxMINOR_VERSION}/web-extensions")
+    if(wxVERSION_IS_DEV)
+        set(WX_WEB_EXTENSIONS_DIRECTORY "lib/wx/${wxMAJOR_VERSION}.${wxMINOR_VERSION}.${wxRELEASE_NUMBER}/web-extensions")
+    else()
+        set(WX_WEB_EXTENSIONS_DIRECTORY "lib/wx/${wxMAJOR_VERSION}.${wxMINOR_VERSION}/web-extensions")
+    endif()
     wx_lib_compile_definitions(wxwebview PRIVATE
         -DWX_WEB_EXTENSIONS_DIRECTORY="${CMAKE_INSTALL_PREFIX}/${WX_WEB_EXTENSIONS_DIRECTORY}"
         )