diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1288473..ed8a818 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,8 +23,9 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 include(CheckPIESupported)
 check_pie_supported(LANGUAGES CXX)
+set(USER_DEFINED_PIE (DEFINED CMAKE_POSITION_INDEPENDENT_CODE))
 if (CMAKE_CXX_LINK_PIE_SUPPORTED)
-    if (NOT DEFINED CMAKE_POSITION_INDEPENDENT_CODE)
+    if (NOT USER_DEFINED_PIE)
         set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
     endif()
 else()
@@ -161,6 +162,9 @@ if (NOT (UPPERCASE_BUILD_TYPE STREQUAL "DEBUG" OR UPPERCASE_BUILD_TYPE STREQUAL
     include(FindSelfPackers)
     if (SELF_PACKER_FOR_EXECUTABLE MATCHES upx) # UPX version d61edc9 or higher is required when using a cross-compiler to target the musl C library
         set(SELF_PACKER_FOR_EXECUTABLE_FLAGS ${SELF_PACKER_FOR_EXECUTABLE_FLAGS} --ultra-brute --best)
+        if (USER_DEFINED_PIE AND CMAKE_POSITION_INDEPENDENT_CODE)
+            message(NOTICE "-- Could NOT manually enable PIE (UPX is in use)")
+        endif()
         set(CMAKE_POSITION_INDEPENDENT_CODE FALSE)
         set_target_properties(${EXENAME} PROPERTIES POSITION_INDEPENDENT_CODE ${CMAKE_POSITION_INDEPENDENT_CODE})
     endif()