diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index df048ef..6a6b580 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -122,6 +122,8 @@ configure_package_config_file(
 install(
 	FILES "${project_config}" "${version_config}"
 	DESTINATION "${config_install_dir}"
+	# We don't want someone by accident modify his installed files
+	PERMISSIONS OWNER_EXECUTE OWNER_READ
 )
 
 # Config
@@ -129,6 +131,8 @@ install(
 install(EXPORT "${TARGETS_EXPORT_NAME}"
 	DESTINATION "${config_install_dir}"
 	NAMESPACE "${namespace}"
+	# We don't want someone by accident modify his installed files
+	PERMISSIONS OWNER_EXECUTE OWNER_READ
 	)
 
 # Export headers (Install public headers)
diff --git a/lib/cmake/InstallHelp.cmake b/lib/cmake/InstallHelp.cmake
index 447f357..83b4fe4 100644
--- a/lib/cmake/InstallHelp.cmake
+++ b/lib/cmake/InstallHelp.cmake
@@ -8,7 +8,12 @@ macro(install_public_headers_with_directory HEADER_LIST IGNORE_PREFIX)
 	foreach(HEADER ${${HEADER_LIST}})
 		get_filename_component(DIR ${HEADER} DIRECTORY)
 		string(REPLACE ${IGNORE_PREFIX} "" DIR ${DIR})
-		install(FILES ${HEADER} DESTINATION include/${DIR})
+		install(
+			FILES ${HEADER}
+			DESTINATION include/${DIR}
+			# We don't want someone by accident modify his installed files
+			PERMISSIONS OWNER_EXECUTE OWNER_READ
+		)
 	endforeach(HEADER)
 
 endmacro(install_public_headers_with_directory)