diff --git a/src/zint/scripts/cmake/find-packages-from-python.cmake b/src/zint/scripts/cmake/find-packages-from-python.cmake
index 2212dae6..e18986f6 100644
--- a/src/zint/scripts/cmake/find-packages-from-python.cmake
+++ b/src/zint/scripts/cmake/find-packages-from-python.cmake
@@ -4,9 +4,17 @@ find_package(Python3 COMPONENTS Interpreter Development REQUIRED)
 execute_process(
 	COMMAND ${Python3_EXECUTABLE} -m site --user-site
 	OUTPUT_VARIABLE Python3_USERSITELIB
-	COMMAND_ERROR_IS_FATAL ANY
+	RESULT_VARIABLE EXIT_CODE
 )
-string(STRIP "${Python3_USERSITELIB}" Python3_USERSITELIB)
 
+if (EXIT_CODE GREATER_EQUAL 2)
+	message(FATAL_ERROR "Unknown error getting user site-packages.")
+endif()
+
+if (EXIT_CODE EQUAL 0)
+	string(STRIP "${Python3_USERSITELIB}" Python3_USERSITELIB)
+	list(APPEND CMAKE_PREFIX_PATH "${Python3_USERSITELIB}")
+endif()
+
+list(APPEND CMAKE_PREFIX_PATH "${Python3_SITELIB}")
 message(STATUS "Appended ${Python3_SITELIB} and ${Python3_USERSITELIB} to the list of cmake prefixes")
-list(APPEND CMAKE_PREFIX_PATH "${Python3_USERSITELIB}" "${Python3_SITELIB}")