diff --git a/httpie/output/ui/man_pages.py b/httpie/output/ui/man_pages.py
index 0ba4974578..350882a24e 100644
--- a/httpie/output/ui/man_pages.py
+++ b/httpie/output/ui/man_pages.py
@@ -2,6 +2,7 @@
 
 import subprocess
 import os
+import sys
 from httpie.context import Environment
 
 
@@ -18,7 +19,7 @@ def is_available(program: str) -> bool:
     Check whether `program`'s man pages are available on this system.
 
     """
-    if NO_MAN_PAGES or os.system == 'nt':
+    if NO_MAN_PAGES or sys.platform == 'win32':
         return False
     try:
         process = subprocess.run(
@@ -45,4 +46,4 @@ def display_for(env: Environment, program: str) -> None:
         [MAN_COMMAND, MAN_PAGE_SECTION, program],
         stdout=env.stdout,
         stderr=env.stderr
-    )
+    )
\ No newline at end of file