diff --git a/xpra/scripts/main.py b/xpra/scripts/main.py
index db31f226bd..7c2f585a09 100755
--- a/xpra/scripts/main.py
+++ b/xpra/scripts/main.py
@@ -109,6 +109,8 @@ def main(script_file, cmdline):
     #turn off gdk scaling to make sure we get the actual window geometry:
     os.environ["GDK_SCALE"]="1"
     os.environ["GDK_DPI_SCALE"] = "1"
+    if WIN32 and os.environ.get("CRYPTOGRAPHY_OPENSSL_NO_LEGACY") is None:
+        os.environ["CRYPTOGRAPHY_OPENSSL_NO_LEGACY"] = "1"
     #client side decorations break window geometry,
     #disable this "feature" unless explicitly enabled:
     if os.environ.get("GTK_CSD") is None: