diff --git a/t/t3032-merge-recursive-options.sh b/t/t3032-merge-recursive-options.sh
index 2b17311cb0..5fd7bbb652 100755
--- a/t/t3032-merge-recursive-options.sh
+++ b/t/t3032-merge-recursive-options.sh
@@ -14,7 +14,7 @@ test_description='merge-recursive options
 . ./test-lib.sh
 
 test_have_prereq SED_STRIPS_CR && SED_OPTIONS=-b
-test_have_prereq MINGW && export GREP_OPTIONS=-U
+test_have_prereq GREP_STRIPS_CR && export GREP_OPTIONS=-U
 
 test_expect_success 'setup' '
 	conflict_hunks () {
diff --git a/t/t5560-http-backend-noserver.sh b/t/t5560-http-backend-noserver.sh
index ef98d95e00..9be9ae3436 100755
--- a/t/t5560-http-backend-noserver.sh
+++ b/t/t5560-http-backend-noserver.sh
@@ -5,7 +5,7 @@ test_description='test git-http-backend-noserver'
 
 HTTPD_DOCUMENT_ROOT_PATH="$TRASH_DIRECTORY"
 
-test_have_prereq MINGW && export GREP_OPTIONS=-U
+test_have_prereq GREP_STRIPS_CR && export GREP_OPTIONS=-U
 
 run_backend() {
 	echo "$2" |
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 657b0bd862..6d4d11b7af 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -668,6 +668,7 @@ case $(uname -s) in
 	test_set_prereq MINGW
 	test_set_prereq NOT_CYGWIN
 	test_set_prereq SED_STRIPS_CR
+	test_set_prereq GREP_STRIPS_CR
 	;;
 *CYGWIN*)
 	test_set_prereq POSIXPERM
@@ -675,6 +676,7 @@ case $(uname -s) in
 	test_set_prereq NOT_MINGW
 	test_set_prereq CYGWIN
 	test_set_prereq SED_STRIPS_CR
+	test_set_prereq GREP_STRIPS_CR
 	;;
 *)
 	test_set_prereq POSIXPERM