diff --git a/conf/CMakeLists.txt b/conf/CMakeLists.txt
index d41c1a8db..83bca07b4 100644
--- a/conf/CMakeLists.txt
+++ b/conf/CMakeLists.txt
@@ -3,7 +3,10 @@
 ########################################################################
 file(GLOB RTL433_CONF_FILES "*.conf")
 
+# Note that apparently bare `etc` or relative CMAKE_INSTALL_SYSCONFDIR
+# always gets CMAKE_INSTALL_PREFIX prepended.
+# Use absolute CMAKE_INSTALL_FULL_SYSCONFDIR to get /etc for /usr prefix.
 install(FILES
     ${RTL433_CONF_FILES}
-    DESTINATION etc/rtl_433
+    DESTINATION ${CMAKE_INSTALL_FULL_SYSCONFDIR}/rtl_433
 )