diff --git a/include/wtsapi32.h b/include/wtsapi32.h
index f329bd5cf06..91309cc5b56 100644
--- a/include/wtsapi32.h
+++ b/include/wtsapi32.h
@@ -122,6 +122,33 @@ typedef struct _WTS_SESSION_INFOW
 DECL_WINELIB_TYPE_AW(WTS_SESSION_INFO)
 DECL_WINELIB_TYPE_AW(PWTS_SESSION_INFO)
 
+typedef struct _WTS_SESSION_INFO_1A
+{
+    DWORD ExecEnvId;
+    WTS_CONNECTSTATE_CLASS State;
+    DWORD SessionId;
+    char *pSessionName;
+    char *pHostName;
+    char *pUserName;
+    char *pDomainName;
+    char *pFarmName;
+} WTS_SESSION_INFO_1A, *PWTS_SESSION_INFO_1A;
+
+typedef struct _WTS_SESSION_INFO_1W
+{
+    DWORD ExecEnvId;
+    WTS_CONNECTSTATE_CLASS State;
+    DWORD SessionId;
+    WCHAR *pSessionName;
+    WCHAR *pHostName;
+    WCHAR *pUserName;
+    WCHAR *pDomainName;
+    WCHAR *pFarmName;
+} WTS_SESSION_INFO_1W, *PWTS_SESSION_INFO_1W;
+
+DECL_WINELIB_TYPE_AW(WTS_SESSION_INFO_1)
+DECL_WINELIB_TYPE_AW(PWTS_SESSION_INFO_1)
+
 typedef struct _WTS_SERVER_INFOA
 {
     LPSTR pServerName;