diff --git a/reactos/dll/win32/msgina/gui.c b/reactos/dll/win32/msgina/gui.c
index 3ac474dd8cc..ec41f4b5032 100644
--- a/reactos/dll/win32/msgina/gui.c
+++ b/reactos/dll/win32/msgina/gui.c
@@ -1306,7 +1306,10 @@ DoUnlock(
     BOOL res = FALSE;
 
     if (GetTextboxText(hwndDlg, IDC_USERNAME, &UserName) && *UserName == '\0')
+    {
+        HeapFree(GetProcessHeap(), 0, UserName);
         return FALSE;
+    }
 
     if (GetTextboxText(hwndDlg, IDC_PASSWORD, &Password))
     {