diff --git a/scripts/buildsystems/vcpkg.cmake b/scripts/buildsystems/vcpkg.cmake
index 15496ce45a..739495fb7e 100644
--- a/scripts/buildsystems/vcpkg.cmake
+++ b/scripts/buildsystems/vcpkg.cmake
@@ -56,12 +56,13 @@ if(VCPKG_PREFER_SYSTEM_LIBS)
 endif()
 
 # Manifest options and settings
+set(Z_VCPKG_MANIFEST_DIR_INITIAL_VALUE "${VCPKG_MANIFEST_DIR}")
 if(NOT DEFINED VCPKG_MANIFEST_DIR)
     if(EXISTS "${CMAKE_SOURCE_DIR}/vcpkg.json")
-        set(VCPKG_MANIFEST_DIR "${CMAKE_SOURCE_DIR}")
+        set(Z_VCPKG_MANIFEST_DIR_INITIAL_VALUE "${CMAKE_SOURCE_DIR}")
     endif()
 endif()
-set(VCPKG_MANIFEST_DIR "${VCPKG_MANIFEST_DIR}"
+set(VCPKG_MANIFEST_DIR "${Z_VCPKG_MANIFEST_DIR_INITIAL_VALUE}"
     CACHE PATH "The path to the vcpkg manifest directory." FORCE)
 
 if(DEFINED VCPKG_MANIFEST_DIR AND NOT VCPKG_MANIFEST_DIR STREQUAL "")
@@ -392,16 +393,16 @@ if(NOT Z_VCPKG_ROOT_DIR)
 endif()
 
 if(DEFINED VCPKG_INSTALLED_DIR)
-    # do nothing
+    set(Z_VCPKG_INSTALLED_DIR_INITIAL_VALUE "${VCPKG_INSTALLED_DIR}")
 elseif(DEFINED _VCPKG_INSTALLED_DIR)
-    set(VCPKG_INSTALLED_DIR "${_VCPKG_INSTALLED_DIR}")
+    set(Z_VCPKG_INSTALLED_DIR_INITIAL_VALUE "${_VCPKG_INSTALLED_DIR}")
 elseif(VCPKG_MANIFEST_MODE)
-    set(VCPKG_INSTALLED_DIR "${CMAKE_BINARY_DIR}/vcpkg_installed")
+    set(Z_VCPKG_INSTALLED_DIR_INITIAL_VALUE "${CMAKE_BINARY_DIR}/vcpkg_installed")
 else()
-    set(VCPKG_INSTALLED_DIR "${Z_VCPKG_ROOT_DIR}/installed")
+    set(Z_VCPKG_INSTALLED_DIR_INITIAL_VALUE "${Z_VCPKG_ROOT_DIR}/installed")
 endif()
 
-set(VCPKG_INSTALLED_DIR "${VCPKG_INSTALLED_DIR}"
+set(VCPKG_INSTALLED_DIR "${Z_VCPKG_INSTALLED_DIR_INITIAL_VALUE}"
     CACHE PATH
     "The directory which contains the installed libraries for each triplet" FORCE)
 set(_VCPKG_INSTALLED_DIR "${VCPKG_INSTALLED_DIR}"