diff --git a/MozillaFirefox.changes b/MozillaFirefox.changes
index 4b7c284..8531335 100644
--- a/MozillaFirefox.changes
+++ b/MozillaFirefox.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed May 13 12:21:13 UTC 2020 - Michel Normand <normand@linux.vnet.ibm.com>
+
+- change again _constraints for ppc64le use <physicalmemory>
+  and increase limit_build in spec file to reduce max_jobs.
+
 -------------------------------------------------------------------
 Sat May  9 11:45:39 UTC 2020 - Wolfgang Rosenauer <wr@rosenauer.org>
 
diff --git a/MozillaFirefox.spec b/MozillaFirefox.spec
index a9667bd..2975298 100644
--- a/MozillaFirefox.spec
+++ b/MozillaFirefox.spec
@@ -382,7 +382,11 @@ echo "export RUSTFLAGS=\"$RUSTFLAGS\""
 echo ""
 cat << EOF
 %else
+%ifarch ppc64 ppc64le
+%limit_build -m 2500
+%else
 %limit_build -m 2000
+%endif
 cat << EOF > $MOZCONFIG
 %endif
 mk_add_options MOZILLA_OFFICIAL=1
diff --git a/_constraints b/_constraints
index 5566790..1a3e31c 100644
--- a/_constraints
+++ b/_constraints
@@ -50,9 +50,9 @@
       <disk>
         <size unit="G">25</size>
       </disk>
-      <memory>
+      <physicalmemory>
         <size unit="G">10</size>
-      </memory>
+      </physicalmemory>
     </hardware>
   </overwrite>
 </constraints>