diff --git a/netpbm.changes b/netpbm.changes
index edc492b..3922a32 100644
--- a/netpbm.changes
+++ b/netpbm.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Sep 14 13:15:23 UTC 2022 - Andreas Schwab <schwab@suse.de>
+
+- ppmforge-test.patch: fix ppmforge test to avoid float overflow
+
 -------------------------------------------------------------------
 Sun Dec 19 17:47:53 UTC 2021 - Andreas Schwab <schwab@suse.de>
 
diff --git a/netpbm.spec b/netpbm.spec
index 606e889..4c848a6 100644
--- a/netpbm.spec
+++ b/netpbm.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package netpbm
 #
-# Copyright (c) 2021 SUSE LLC
+# Copyright (c) 2022 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -47,6 +47,8 @@ Patch6:         signed-char.patch
 Patch7:         big-endian.patch
 # bsc#1144255 disable jpeg2k support due to removal of jasper
 Patch8:         netpbm-disable-jasper.patch
+# PATCH-FIX-UPSTREAM fix ppmforge test to avoid float overflow
+Patch9:         ppmforge-test.patch
 BuildRequires:  flex
 BuildRequires:  libjpeg-devel
 BuildRequires:  libpng-devel
diff --git a/ppmforge-test.patch b/ppmforge-test.patch
new file mode 100644
index 0000000..34dd634
--- /dev/null
+++ b/ppmforge-test.patch
@@ -0,0 +1,16 @@
+Index: netpbm-10.96.4/test/ppmforge.test
+===================================================================
+--- netpbm-10.96.4.orig/test/ppmforge.test
++++ netpbm-10.96.4/test/ppmforge.test
+@@ -44,9 +44,9 @@ rm ${test_ppm}
+ 
+ echo "Test 5."
+ ppmforge -seed 1 -stars 0 -ice 0.01 \
+-    -inclination 9  -hour 12 -power 200 > ${test_ppm} 
++    -inclination 9  -hour 12 -power 20 > ${test_ppm} 
+ ppmforge -seed 1 -stars 0 -ice 0.01 \
+-    -inclination 10 -hour 12 -power 200 | \
++    -inclination 10 -hour 12 -power 20 | \
+   pnmpsnr -target1=53.89 -target2=49.38 -target3=65.15 - ${test_ppm}
+ 
+ rm ${test_ppm}