diff --git a/CMakeLists.txt b/CMakeLists.txt
index ef2a6c246..c878e3ccb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -344,10 +344,6 @@ endif()
 set(libpng_sources
   ${libpng_public_hdrs}
   ${libpng_private_hdrs}
-  pngdebug.h
-  pnginfo.h
-  pngpriv.h
-  pngstruct.h
   png.c
   pngerror.c
   pngget.c