diff --git a/poky/meta/classes/buildhistory.bbclass b/poky/meta/classes/buildhistory.bbclass
index a4288ef..805e976 100644
--- a/poky/meta/classes/buildhistory.bbclass
+++ b/poky/meta/classes/buildhistory.bbclass
@@ -429,8 +429,8 @@
     from oe.sdk import sdk_list_installed_packages
     from oe.utils import format_pkg_list
 
-    process_list = [('file', 'bh_installed_pkgs.txt'),\
-                    ('deps', 'bh_installed_pkgs_deps.txt')]
+    process_list = [('file', 'bh_installed_pkgs_%s.txt' % os.getpid()),\
+                    ('deps', 'bh_installed_pkgs_deps_%s.txt' % os.getpid())]
 
     if rootfs_type == "image":
         pkgs = image_list_installed_packages(d)
@@ -460,9 +460,10 @@
 
 	# Get list of installed packages
 	pkgcache="$1/installed-packages.tmp"
-	cat ${WORKDIR}/bh_installed_pkgs.txt | sort > $pkgcache && rm ${WORKDIR}/bh_installed_pkgs.txt
+	cat ${WORKDIR}/bh_installed_pkgs_${PID}.txt | sort > $pkgcache && rm ${WORKDIR}/bh_installed_pkgs_${PID}.txt
 
 	cat $pkgcache | awk '{ print $1 }' > $1/installed-package-names.txt
+
 	if [ -s $pkgcache ] ; then
 		cat $pkgcache | awk '{ print $2 }' | xargs -n1 basename > $1/installed-packages.txt
 	else
@@ -471,8 +472,8 @@
 
 	# Produce dependency graph
 	# First, quote each name to handle characters that cause issues for dot
-	sed 's:\([^| ]*\):"\1":g' ${WORKDIR}/bh_installed_pkgs_deps.txt > $1/depends.tmp &&
-		rm ${WORKDIR}/bh_installed_pkgs_deps.txt
+	sed 's:\([^| ]*\):"\1":g' ${WORKDIR}/bh_installed_pkgs_deps_${PID}.txt > $1/depends.tmp &&
+		rm ${WORKDIR}/bh_installed_pkgs_deps_${PID}.txt
 	# Remove lines with rpmlib(...) and config(...) dependencies, change the
 	# delimiter from pipe to "->", set the style for recommend lines and
 	# turn versioned dependencies into edge labels.