diff --git a/cachegrind/cg-ppc32.c b/cachegrind/cg-ppc32.c
index 7c46c7aee..a434ab3c9 100644
--- a/cachegrind/cg-ppc32.c
+++ b/cachegrind/cg-ppc32.c
@@ -46,7 +46,7 @@ void VG_(configure_caches)(cache_t* I1c, cache_t* D1c, cache_t* L2c,
    // Warn if config not completely specified from cmd line.
    if (!all_caches_clo_defined) {
       VG_(message)(Vg_DebugMsg, 
-                   "Warning: Couldn't auto-detect cache config, using one "
+                   "Warning: Cannot auto-detect cache config on PPC32, using one "
                    "or more defaults ");
    }
 }
diff --git a/cachegrind/tests/filter_stderr b/cachegrind/tests/filter_stderr
index e7240f6ae..c961a9055 100755
--- a/cachegrind/tests/filter_stderr
+++ b/cachegrind/tests/filter_stderr
@@ -17,4 +17,4 @@ sed "s/\(\(I1\|D1\|L2\|L2i\|L2d\) *\(misses\|miss rate\):\)[ 0-9,()+rdw%\.]*$/\1
 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: Couldn't auto-detect cache config, using one or more defaults/d"
+sed "/Warning: Cannot auto-detect cache config on PPC32, using one or more defaults/d"