diff --git a/plugins/html-preview/html_preview_plugin/__init__.py b/plugins/html-preview/html_preview_plugin/__init__.py
index 9d479530547487a00de523ed1d51f96a008103cc..4962266f4ac739ba930ccd9255bf816596980bfc 100644
--- a/plugins/html-preview/html_preview_plugin/__init__.py
+++ b/plugins/html-preview/html_preview_plugin/__init__.py
@@ -94,18 +94,6 @@ builtins.open = new_open
 _ = Ide.gettext
 
 
-def is_sphinx_installed():
-    with open(os.devnull, 'w') as devnull:
-        try:
-            if subprocess.call(['sphinx-build', '--version'],
-                               stdout=devnull, stderr=devnull) == 0:
-                return True
-        except FileNotFoundError:
-            pass
-
-        return False
-
-
 class SphinxState():
     def __init__(self, builddir):
         self.builddir = builddir