diff --git a/tests/playTests.sh b/tests/playTests.sh
index 90575c0c..26021311 100755
--- a/tests/playTests.sh
+++ b/tests/playTests.sh
@@ -254,14 +254,6 @@ ZCAT=./zstdcat $ZSTDGREP 2>&1 "1234" tmp_grep_bad.zst && die "Should have failed
 ZCAT=./zstdcat $ZSTDGREP 2>&1 "1234" tmp_grep_bad.zst | grep "No such file or directory" || true
 rm -f tmp_grep*
 
-println "\n===> zstdgrep pipe in with -f "
-echo "start" > tmp_grep
-echo "stop" >> tmp_grep
-echo "start" | ZCAT=./zstdcat $ZSTDGREP -f - tmp_grep > tmp_grep_out1
-echo "start" | grep -f - tmp_grep > tmp_grep_out2
-$DIFF tmp_grep_out1 tmp_grep_out2
-rm -f tmp_grep*
-
 println "\n===> zstdgrep --regexp= multiple"
 echo "start" > tmp_grep
 echo "stop" >> tmp_grep