diff --git a/types.go b/types.go
index af3651999..e9215519a 100644
--- a/types.go
+++ b/types.go
@@ -219,7 +219,7 @@ const (
 type AttachFlags uint32
 
 // PinType determines whether a map is pinned into a BPFFS.
-type PinType int
+type PinType uint32
 
 // Valid pin types.
 //
diff --git a/types_string.go b/types_string.go
index 5679f2254..e20c37aa4 100644
--- a/types_string.go
+++ b/types_string.go
@@ -111,7 +111,7 @@ const _PinType_name = "PinNonePinByName"
 var _PinType_index = [...]uint8{0, 7, 16}
 
 func (i PinType) String() string {
-	if i < 0 || i >= PinType(len(_PinType_index)-1) {
+	if i >= PinType(len(_PinType_index)-1) {
 		return "PinType(" + strconv.FormatInt(int64(i), 10) + ")"
 	}
 	return _PinType_name[_PinType_index[i]:_PinType_index[i+1]]