diff --git a/t/t0024-crlf-archive.sh b/t/t0024-crlf-archive.sh
index ec6c1b3f8a..080fe5c6dd 100755
--- a/t/t0024-crlf-archive.sh
+++ b/t/t0024-crlf-archive.sh
@@ -3,7 +3,7 @@
 test_description='respect crlf in git archive'
 
 . ./test-lib.sh
-UNZIP=${UNZIP:-unzip}
+GIT_UNZIP=${GIT_UNZIP:-unzip}
 
 test_expect_success setup '
 
@@ -26,7 +26,7 @@ test_expect_success 'tar archive' '
 
 '
 
-"$UNZIP" -v >/dev/null 2>&1
+"$GIT_UNZIP" -v >/dev/null 2>&1
 if [ $? -eq 127 ]; then
 	say "Skipping ZIP test, because unzip was not found"
 else
@@ -37,7 +37,7 @@ test_expect_success UNZIP 'zip archive' '
 
 	git archive --format=zip HEAD >test.zip &&
 
-	( mkdir unzipped && cd unzipped && unzip ../test.zip ) &&
+	( mkdir unzipped && cd unzipped && "$GIT_UNZIP" ../test.zip ) &&
 
 	test_cmp sample unzipped/sample
 
diff --git a/t/t5000-tar-tree.sh b/t/t5000-tar-tree.sh
index ecf00edab2..1f7593dc7a 100755
--- a/t/t5000-tar-tree.sh
+++ b/t/t5000-tar-tree.sh
@@ -25,7 +25,7 @@ commit id embedding:
 '
 
 . ./test-lib.sh
-UNZIP=${UNZIP:-unzip}
+GIT_UNZIP=${GIT_UNZIP:-unzip}
 GZIP=${GZIP:-gzip}
 GUNZIP=${GUNZIP:-gzip -d}
 
@@ -37,9 +37,9 @@ check_zip() {
 	dir=$1
 	dir_with_prefix=$dir/$2
 
-	test_expect_success UNZIP " extract ZIP archive" "
-		(mkdir $dir && cd $dir && $UNZIP ../$zipfile)
-	"
+	test_expect_success UNZIP " extract ZIP archive" '
+		(mkdir $dir && cd $dir && "$GIT_UNZIP" ../$zipfile)
+	'
 
 	test_expect_success UNZIP " validate filenames" "
 		(cd ${dir_with_prefix}a && find .) | sort >$listfile &&
@@ -201,7 +201,7 @@ test_expect_success \
       test_cmp a/substfile2 g/prefix/a/substfile2
 '
 
-$UNZIP -v >/dev/null 2>&1
+"$GIT_UNZIP" -v >/dev/null 2>&1
 if [ $? -eq 127 ]; then
 	say "Skipping ZIP tests, because unzip was not found"
 else
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 489bc80fc1..c9a6b03953 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -85,6 +85,7 @@ unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
 		.*_TEST
 		PROVE
 		VALGRIND
+		UNZIP
 		PERF_AGGREGATING_LATER
 	));
 	my @vars = grep(/^GIT_/ && !/^GIT_($ok)/o, @env);
@@ -128,6 +129,7 @@ fi
 unset CDPATH
 
 unset GREP_OPTIONS
+unset UNZIP
 
 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
 1|2|true)