diff --git a/cachegrind/tests/filter_stderr b/cachegrind/tests/filter_stderr
index f43e5d5..e7240f6 100755
--- a/cachegrind/tests/filter_stderr
+++ b/cachegrind/tests/filter_stderr
@@ -16,4 +16,5 @@
 # Remove CPUID warnings lines for P4s and other machines
 sed "/warning: Pentium 4 with 12 KB micro-op instruction trace cache/d" |
 sed "/Simulating a 16 KB I-cache with 32 B lines/d"   |
-sed "/warning: L3 cache detected but ignored/d"
+sed "/warning: L3 cache detected but ignored/d" |
+sed "/Warning: Couldn't auto-detect cache config, using one or more defaults/d"