diff --git a/windows/security_windows.go b/windows/security_windows.go
index b84840fe..61b49647 100644
--- a/windows/security_windows.go
+++ b/windows/security_windows.go
@@ -603,12 +603,22 @@ type Tokenprimarygroup struct {
 
 type Tokengroups struct {
 	GroupCount uint32
-	Groups     [1]SIDAndAttributes
+	Groups     [1]SIDAndAttributes // Use AllGroups() for iterating.
+}
+
+// AllGroups returns a slice that can be used to iterate over the groups in g.
+func (g *Tokengroups) AllGroups() []SIDAndAttributes {
+	return (*[(1 << 28) - 1]SIDAndAttributes)(unsafe.Pointer(&g.Groups[0]))[:g.GroupCount:g.GroupCount]
 }
 
 type Tokenprivileges struct {
 	PrivilegeCount uint32
-	Privileges     [1]LUIDAndAttributes
+	Privileges     [1]LUIDAndAttributes // Use AllPrivileges() for iterating.
+}
+
+// AllPrivileges returns a slice that can be used to iterate over the privileges in p.
+func (p *Tokenprivileges) AllPrivileges() []LUIDAndAttributes {
+	return (*[(1 << 27) - 1]LUIDAndAttributes)(unsafe.Pointer(&p.Privileges[0]))[:p.PrivilegeCount:p.PrivilegeCount]
 }
 
 type Tokenmandatorylabel struct {