diff --git a/base/services/rpcss/setup.c b/base/services/rpcss/setup.c
index e51831efc41..e94a05c9264 100644
--- a/base/services/rpcss/setup.c
+++ b/base/services/rpcss/setup.c
@@ -65,7 +65,7 @@ RunningAsSYSTEM(VOID)
         return FALSE;
 
     /* Retrieve token's information */
-    if (!GetTokenInformation(hToken, TokenUser, NULL, 0, &cbTokenBuffer) &&
+    if (GetTokenInformation(hToken, TokenUser, NULL, 0, &cbTokenBuffer) ||
         GetLastError() != ERROR_INSUFFICIENT_BUFFER)
     {
         goto Quit;
diff --git a/base/services/svchost/security.cxx b/base/services/svchost/security.cxx
index 0dfb9adf222..451d6c2929a 100644
--- a/base/services/svchost/security.cxx
+++ b/base/services/svchost/security.cxx
@@ -53,14 +53,14 @@ DwInitializeSdFromThreadToken (
     }
 
     /* Get the size of the token's user */
-    if ((GetTokenInformation(hToken, TokenUser, NULL, 0, &dwUserLength) == FALSE) ||
+    if ((GetTokenInformation(hToken, TokenUser, NULL, 0, &dwUserLength) != FALSE) ||
         (GetLastError() != ERROR_INSUFFICIENT_BUFFER))
     {
         return GetLastError();
     }
 
     /* Get the size of the token's primary group */
-    if ((GetTokenInformation(hToken, TokenPrimaryGroup, NULL, 0, &dwGroupLength) == FALSE) ||
+    if ((GetTokenInformation(hToken, TokenPrimaryGroup, NULL, 0, &dwGroupLength) != FALSE) ||
         (GetLastError() != ERROR_INSUFFICIENT_BUFFER))
     {
         return GetLastError();
diff --git a/dll/cpl/sysdm/userprofile.c b/dll/cpl/sysdm/userprofile.c
index 58e35f964bd..79f76b76225 100644
--- a/dll/cpl/sysdm/userprofile.c
+++ b/dll/cpl/sysdm/userprofile.c
@@ -695,9 +695,11 @@ AddUserProfiles(
     if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken))
         return;
 
-    GetTokenInformation(hToken, TokenUser, NULL, 0, &dwSize);
-    if (dwSize == 0)
+    if (GetTokenInformation(hToken, TokenUser, NULL, 0, &dwSize) ||
+        GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+    {
         goto done;
+    }
 
     pTokenUser = HeapAlloc(GetProcessHeap(), 0, dwSize);
     if (pTokenUser == NULL)
diff --git a/dll/win32/netid/netid.c b/dll/win32/netid/netid.c
index 2e2a1294525..ce3dfb6f417 100644
--- a/dll/win32/netid/netid.c
+++ b/dll/win32/netid/netid.c
@@ -179,14 +179,11 @@ IsUserAdmin(VOID)
                           &hToken))
         goto done;
 
-    dwSize = 0;
-    GetTokenInformation(hToken,
-                        TokenGroups,
-                        NULL,
-                        0,
-                        &dwSize);
-    if (dwSize == 0)
+    if (GetTokenInformation(hToken, TokenGroups, NULL, 0, &dwSize) ||
+        GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+    {
         goto done;
+    }
 
     pGroups = HeapAlloc(GetProcessHeap(), 0, dwSize);
     if (pGroups == NULL)