diff --git a/CMakeLists.txt b/CMakeLists.txt
index 55fc44a1..7ff51473 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,9 @@ include(CPack)
 
 # Generate docs before creating source package
 include(src/Filelists.cmake)
-add_custom_target(dist COMMAND ${CMAKE_MAKE_PROGRAM} package_source)
-if (TARGET lwipdocs)
-  add_dependencies(dist lwipdocs)
+if (NOT TARGET dist)
+  add_custom_target(dist COMMAND ${CMAKE_MAKE_PROGRAM} package_source)
+  if (TARGET lwipdocs)
+    add_dependencies(dist lwipdocs)
+  endif()
 endif()