diff --git a/CMakeLists.txt b/CMakeLists.txt
index 897706d..b4d85ec 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -355,14 +355,6 @@ if (IS_WINDOWS)
         INTERFACE_INCLUDE_DIRECTORIES "${PHP_SDK_DIR}/include;${MPDECIMAL_DIR}/libmpdec++"
     )
 
-    # 复制 DLL 到输出目录
-    file(GLOB MPDEC_DLLS "${PHP_LIBRARY_DIR}/libmpdec-4.0.1.dll" "${PHP_LIBRARY_DIR}/libmpdec++-4.0.1.dll")
-    foreach(_dll ${MPDEC_DLLS})
-        add_custom_command(TARGET phpx POST_BUILD
-            COMMAND ${CMAKE_COMMAND} -E copy_if_different "${_dll}" $<TARGET_FILE_DIR:phpx>
-            COMMENT "Copying ${_dll} to output"
-        )
-    endforeach()
 else()
     # Linux/macOS: 内置编译 mpdecimal + libmpdec++
     message(STATUS "Using bundled mpdecimal with uint128")
@@ -419,6 +411,16 @@ set_target_properties(phpx PROPERTIES
     CLEAN_DIRECT_OUTPUT 1
 )
 
+if (IS_WINDOWS)
+    # Register post-build commands only after the phpx target exists.
+    file(GLOB MPDEC_DLLS "${PHP_LIBRARY_DIR}/libmpdec-4.0.1.dll" "${PHP_LIBRARY_DIR}/libmpdec++-4.0.1.dll")
+    foreach(_dll ${MPDEC_DLLS})
+        add_custom_command(TARGET phpx POST_BUILD
+            COMMAND ${CMAKE_COMMAND} -E copy_if_different "${_dll}" $<TARGET_FILE_DIR:phpx>
+            COMMENT "Copying ${_dll} to output")
+    endforeach()
+endif()
+
 if (IS_WINDOWS)
     target_link_libraries(phpx PRIVATE
         ${PHP_LIBRARY}