diff --git a/docs/libs/Makefile.am b/docs/libs/Makefile.am
index 71ac2e0e60..574e9e59e9 100644
--- a/docs/libs/Makefile.am
+++ b/docs/libs/Makefile.am
@@ -8,7 +8,7 @@ DOC_MODULE=$(MODULE)
 
 # for upload-doc.mak
 DOC=$(MODULE)
-FORMATS=html ps pdf
+FORMATS=html
 html: html-build.stamp
 include $(top_srcdir)/common/upload-doc.mak