diff --git a/weed/util/minfreespace.go b/weed/util/minfreespace.go
index d06981338..044cfc265 100644
--- a/weed/util/minfreespace.go
+++ b/weed/util/minfreespace.go
@@ -87,6 +87,7 @@ var ErrMinFreeSpaceBadValue = errors.New("minFreeSpace is invalid")
 
 // ParseMinFreeSpace parses min free space expression s as percentage like 1,10 or human readable size like 10G
 func ParseMinFreeSpace(s string) (*MinFreeSpace, error) {
+	s = strings.TrimSpace(s)
 	if percent, e := strconv.ParseFloat(s, 32); e == nil {
 		if percent < 0 || percent > 100 {
 			return nil, ErrMinFreeSpaceBadValue
diff --git a/weed/util/minfreespace_test.go b/weed/util/minfreespace_test.go
index eec1942dd..496a50b56 100644
--- a/weed/util/minfreespace_test.go
+++ b/weed/util/minfreespace_test.go
@@ -15,6 +15,8 @@ func TestParseMinFreeSpace(t *testing.T) {
 		{in: "100Ki", ok: true, value: &MinFreeSpace{Type: AsBytes, Bytes: 100 * 1024, Raw: "100Ki"}},
 		{in: "100GiB", ok: true, value: &MinFreeSpace{Type: AsBytes, Bytes: 100 * 1024 * 1024 * 1024, Raw: "100GiB"}},
 		{in: "42M", ok: true, value: &MinFreeSpace{Type: AsBytes, Bytes: 42 * 1000 * 1000, Raw: "42M"}},
+		{in: " 42 ", ok: true, value: &MinFreeSpace{Type: AsPercent, Percent: 42, Raw: "42"}},
+		{in: " 42M ", ok: true, value: &MinFreeSpace{Type: AsBytes, Bytes: 42 * 1000 * 1000, Raw: "42M"}},
 	}
 
 	for _, p := range tests {