diff --git a/ports/proj4/portfile.cmake b/ports/proj4/portfile.cmake
index c6acc6cc8..f7532a967 100644
--- a/ports/proj4/portfile.cmake
+++ b/ports/proj4/portfile.cmake
@@ -59,13 +59,13 @@ string(REPLACE "set(_IMPORT_PREFIX \"${CURRENT_PACKAGES_DIR}\")"
 )
 file(WRITE ${CURRENT_PACKAGES_DIR}/share/proj4/proj4-targets.cmake "${_contents}")
 
-if(WIN32)
-if(NOT DEFINED VCPKG_BUILD_TYPE OR VCPKG_BUILD_TYPE STREQUAL "release")
-    file(RENAME ${CURRENT_PACKAGES_DIR}/lib/proj_4_9.lib  ${CURRENT_PACKAGES_DIR}/lib/proj.lib)
-endif()
-if(NOT DEFINED VCPKG_BUILD_TYPE OR VCPKG_BUILD_TYPE STREQUAL "debug")
-    file(RENAME ${CURRENT_PACKAGES_DIR}/debug/lib/proj_4_9_d.lib  ${CURRENT_PACKAGES_DIR}/debug/lib/projd.lib)
-endif()
+if(NOT VCPKG_CMAKE_SYSTEM_NAME OR VCPKG_CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+    if(NOT DEFINED VCPKG_BUILD_TYPE OR VCPKG_BUILD_TYPE STREQUAL "release")
+        file(RENAME ${CURRENT_PACKAGES_DIR}/lib/proj_4_9.lib  ${CURRENT_PACKAGES_DIR}/lib/proj.lib)
+    endif()
+    if(NOT DEFINED VCPKG_BUILD_TYPE OR VCPKG_BUILD_TYPE STREQUAL "debug")
+        file(RENAME ${CURRENT_PACKAGES_DIR}/debug/lib/proj_4_9_d.lib  ${CURRENT_PACKAGES_DIR}/debug/lib/projd.lib)
+    endif()
 endif()
 
 # Remove duplicate headers installed from debug build