diff --git a/CMakeLists.txt b/CMakeLists.txt
index ee5e59f..15cdc95 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,11 +2,11 @@ cmake_minimum_required(VERSION 3.16)
 
 project(eismultiplexer C)
 
-find_package(PkgConfig REQUIRED)
 find_package(Doxygen)
 
 if(NOT LIBUSB_INCLUDE_DIRS OR NOT LIBUSB_LIBRARIES)
-	pkg_check_modules(LIBUSB REQUIRED libusb-1.0)
+	find_package(PkgConfig REQUIRED)
+	pkg_check_modules(LIBUSB libusb-1.0)
 endif()
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")