diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d5d0f0..8f749e3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -75,7 +75,7 @@ if (UNIX AND NOT MINGW)
     set(CMAKE_INSTALL_PREFIX "/opt")
     set(CPACK_PACKAGING_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
     set(CPACK_PACKAGE_FILE_NAME "${PNAME}_lpkg")
-    set(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA "${CMAKE_CURRENT_SOURCE_DIR}/scripts/postinst.sh")
+    set(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA "${CMAKE_CURRENT_SOURCE_DIR}/scripts/postinst")
     set(CPACK_RPM_POST_INSTALL_SCRIPT_FILE ${CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA})
     set(CPACK_DEBIAN_PACKAGE_DEPENDS "libc6 (>= 2.14), libstdc++6 (>= 9)")
     set(CPACK_DEBIAN_COMPRESSION_TYPE lzma)
diff --git a/scripts/postinst.sh b/scripts/postinst
similarity index 100%
rename from scripts/postinst.sh
rename to scripts/postinst