diff --git a/cmake/AddAutoformatTarget.cmake b/cmake/AddAutoformatTarget.cmake
index baaffaa..07e739f 100644
--- a/cmake/AddAutoformatTarget.cmake
+++ b/cmake/AddAutoformatTarget.cmake
@@ -11,8 +11,14 @@ unset(_CLANG_FORMAT)
 function(add_autoformat_target target)
   get_target_property(source_dir ${target} SOURCE_DIR)
   get_target_property(sources ${target} SOURCES)
+  foreach(source ${sources})
+    get_property(generated SOURCE ${source} PROPERTY GENERATED)
+    if(NOT ${generated})
+      list(APPEND non_generated_sources ${source})
+    endif()
+  endforeach()
   add_custom_target(autoformat_${target}
-    COMMAND clang-format -i -- ${sources}
+    COMMAND clang-format -i -- ${non_generated_sources}
     WORKING_DIRECTORY ${source_dir}
     COMMENT "Autoformating sources of target ${target}"
     VERBATIM)