diff --git a/etc/CMakeLists.txt b/etc/CMakeLists.txt
index 826fff1..3cefc34 100644
--- a/etc/CMakeLists.txt
+++ b/etc/CMakeLists.txt
@@ -6,14 +6,14 @@ install(
     FILES
         ${CMAKE_CURRENT_SOURCE_DIR}/clamd.conf.sample
     DESTINATION
-        ${APP_CONFIG_DIRECTORY}
+        ${CMAKE_INSTALL_PREFIX}/${APP_CONFIG_DIRECTORY}
     COMPONENT programs)
 
 install(
     FILES
         ${CMAKE_CURRENT_SOURCE_DIR}/freshclam.conf.sample
     DESTINATION
-        ${APP_CONFIG_DIRECTORY}
+        ${CMAKE_INSTALL_PREFIX}/${APP_CONFIG_DIRECTORY}
     COMPONENT programs)
 
 if(ENABLE_MILTER)
@@ -21,6 +21,6 @@ if(ENABLE_MILTER)
         FILES
             ${CMAKE_CURRENT_SOURCE_DIR}/clamav-milter.conf.sample
         DESTINATION
-            ${APP_CONFIG_DIRECTORY}
+            ${CMAKE_INSTALL_PREFIX}/${APP_CONFIG_DIRECTORY}
         COMPONENT programs)
 endif()