diff --git a/dlls/netapi32/ds.c b/dlls/netapi32/ds.c
index 03a90e3a682..fbcd665a230 100644
--- a/dlls/netapi32/ds.c
+++ b/dlls/netapi32/ds.c
@@ -20,9 +20,13 @@
 
 #include <stdarg.h>
 
+#include "ntstatus.h"
+#define WIN32_NO_STATUS
 #include "windef.h"
 #include "winbase.h"
 #include "winerror.h"
+#include "winternl.h"
+#include "ntsecapi.h"
 #include "wine/debug.h"
 #include "dsrole.h"
 
@@ -39,7 +43,8 @@ WINE_DEFAULT_DEBUG_CHANNEL(ds);
  */
 VOID WINAPI DsRoleFreeMemory(PVOID Buffer)
 {
-    FIXME("(%p) stub\n", Buffer);
+    TRACE("(%p)\n", Buffer);
+    HeapFree(GetProcessHeap(), 0, Buffer);
 }
 
 /************************************************************
@@ -59,6 +64,8 @@ DWORD WINAPI DsRoleGetPrimaryDomainInformation(
     LPCWSTR lpServer, DSROLE_PRIMARY_DOMAIN_INFO_LEVEL InfoLevel,
     PBYTE* Buffer)
 {
+    DWORD ret;
+
     FIXME("(%p, %d, %p) stub\n", lpServer, InfoLevel, Buffer);
 
     /* Check some input parameters */
@@ -66,5 +73,51 @@ DWORD WINAPI DsRoleGetPrimaryDomainInformation(
     if (!Buffer) return ERROR_INVALID_PARAMETER;
     if ((InfoLevel < DsRolePrimaryDomainInfoBasic) || (InfoLevel > DsRoleOperationState)) return ERROR_INVALID_PARAMETER;
 
-    return E_NOTIMPL;
+    switch (InfoLevel)
+    {
+        case DsRolePrimaryDomainInfoBasic:
+        {
+            LSA_OBJECT_ATTRIBUTES ObjectAttributes;
+            LSA_HANDLE PolicyHandle;
+            PPOLICY_ACCOUNT_DOMAIN_INFO DomainInfo;
+            NTSTATUS NtStatus;
+            int logon_domain_sz;
+            DWORD size;
+            PDSROLE_PRIMARY_DOMAIN_INFO_BASIC basic;
+
+            ZeroMemory(&ObjectAttributes, sizeof(ObjectAttributes));
+            NtStatus = LsaOpenPolicy(NULL, &ObjectAttributes,
+             POLICY_VIEW_LOCAL_INFORMATION, &PolicyHandle);
+            if (NtStatus != STATUS_SUCCESS)
+            {
+                ERR("LsaOpenPolicyFailed with NT status %lx\n",
+                    LsaNtStatusToWinError(NtStatus));
+                return ERROR_OUTOFMEMORY;
+            }
+            LsaQueryInformationPolicy(PolicyHandle,
+             PolicyAccountDomainInformation, (PVOID*)&DomainInfo);
+            logon_domain_sz = lstrlenW(DomainInfo->DomainName.Buffer) + 1;
+            LsaClose(PolicyHandle);
+
+            size = sizeof(DSROLE_PRIMARY_DOMAIN_INFO_BASIC) +
+             logon_domain_sz * sizeof(WCHAR);
+            basic = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
+            if (basic)
+            {
+                basic->MachineRole = DsRole_RoleStandaloneWorkstation;
+                basic->DomainNameFlat = (LPWSTR)((LPBYTE)basic +
+                 sizeof(DSROLE_PRIMARY_DOMAIN_INFO_BASIC));
+                lstrcpyW(basic->DomainNameFlat, DomainInfo->DomainName.Buffer);
+                ret = ERROR_SUCCESS;
+            }
+            else
+                ret = ERROR_OUTOFMEMORY;
+            *Buffer = (PBYTE)basic;
+            LsaFreeMemory(DomainInfo);
+        }
+        break;
+    default:
+        ret = ERROR_CALL_NOT_IMPLEMENTED;
+    }
+    return ret;
 }
diff --git a/dlls/netapi32/tests/ds.c b/dlls/netapi32/tests/ds.c
index f3b238fc9e2..870afb1f362 100644
--- a/dlls/netapi32/tests/ds.c
+++ b/dlls/netapi32/tests/ds.c
@@ -59,7 +59,7 @@ static void test_get(void)
 
     SetLastError(0xdeadbeef);
     ret = pDsRoleGetPrimaryDomainInformation(NULL, DsRolePrimaryDomainInfoBasic, (PBYTE *)&dpdi);
-    todo_wine { ok( ret == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got (%ld)\n", ret); }
+    ok( ret == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got (%ld)\n", ret);
     pDsRoleFreeMemory(&dpdi);
 
     SetLastError(0xdeadbeef);