diff --git a/CMakeLists.txt b/CMakeLists.txt
index eb495f8..07e2338 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,5 +83,9 @@ protocol("unstable/linux-dmabuf/linux-dmabuf-unstable-v1.xml" "linux-dmabuf-unst
 # Installation
 install(TARGETS hyprlock)
 
-install(FILES "pam/hyprlock" DESTINATION "${CMAKE_INSTALL_FULL_SYSCONFDIR}/pam.d")
+install(CODE "
+    if (NOT EXISTS \"${CMAKE_INSTALL_FULL_SYSCONFDIR}/pam.d/hyprlock\")
+        install(FILES \"${CMAKE_SOURCE_DIR}/pam/hyprlock\" DESTINATION \"${CMAKE_INSTALL_FULL_SYSCONFDIR}/pam.d\")
+    endif()
+")