cmake: put exports into libzip:: namespace
diff --git a/CMakeLists.txt b/CMakeLists.txt
index adb19c0..2633b2f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -481,6 +481,7 @@
 
 if(LIBZIP_DO_INSTALL)
   install(EXPORT ${PROJECT_NAME}-targets
+    NAMESPACE libzip::
     FILE ${PROJECT_NAME}-targets.cmake
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
     )