diff --git a/pari.changes b/pari.changes
index c198d06..3f81594 100644
--- a/pari.changes
+++ b/pari.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Sun Oct 31 20:36:12 UTC 2021 - Anton Shvetz <shvetz.anton@gmail.com>
+
+- Split '%make_build all docpdf' into separate executions due to
+  non-reproducible results during parallel build with varying
+  numbers of jobs. Thanks to Bernhard M. Wiedemann for reporting
+  the bug.
+
 -------------------------------------------------------------------
 Fri Oct 29 01:01:54 UTC 2021 - Anton Shvetz <shvetz.anton@gmail.com>
 
diff --git a/pari.spec b/pari.spec
index 0a8522f..100680d 100644
--- a/pari.spec
+++ b/pari.spec
@@ -109,12 +109,14 @@ sed -i -e 's/^\(doc all:\) .*/\1/' config/DOC_Make.SH
 	--sysdatadir="%_libdir" \
 	--datadir="%_datadir/%name" \
 	--mt=pthread
-%make_build -e \
+%make_build \
 	CFLAGS="%optflags -fno-strict-aliasing" \
 	STRIP=true \
+	all
+%make_build \
 	PDFTEX=luatex \
 	PDFLATEX=lualatex \
-	all docpdf
+	docpdf
 
 %install
 %make_install