diff --git a/valgrind_existing.sh b/valgrind_existing.sh
index 96b191e15..cad8fa065 100755
--- a/valgrind_existing.sh
+++ b/valgrind_existing.sh
@@ -38,6 +38,8 @@ SKIP_BINARIES+=("$(ls ./"${TEST_BINARIES_TARGET}"release/test_ir4* || true )")
 SKIP_BINARIES+=("$(ls ./"${TEST_BINARIES_TARGET}"release/*imageflow_helpers* || true )")
 SKIP_BINARIES+=("$(ls ./"${TEST_BINARIES_TARGET}"release/*imageflow_riapi* || true )")
 SKIP_BINARIES+=("$(ls ./"${TEST_BINARIES_TARGET}"release/*imageflow_types* || true )")
+SKIP_BINARIES+=("$(ls ./"${TEST_BINARIES_TARGET}"release/bench_graphics* || true )")
+
 function join_by { local IFS="$1"; shift; echo "$*"; }
 SKIP_BINARIES_STR="$(join_by " " "${SKIP_BINARIES[@]}")"
 SKIP_BINARIES_STR=" $SKIP_BINARIES_STR "
diff --git a/valgrind_suppressions.txt b/valgrind_suppressions.txt
index 2f79512da..12169d1d1 100644
--- a/valgrind_suppressions.txt
+++ b/valgrind_suppressions.txt
@@ -158,4 +158,15 @@
    fun:deflate_fast
    fun:deflate
    ...
-}
\ No newline at end of file
+}
+
+{
+   See http://zlib.net/zlib_faq.html#faq36
+   Memcheck:Cond
+   fun:slide_hash
+   fun:fill_window
+   fun:deflate_fast
+   fun:deflate
+   fun:png_compress_IDAT
+   ...
+}