diff --git a/src/multilspy/language_servers/omnisharp/omnisharp.py b/src/multilspy/language_servers/omnisharp/omnisharp.py
index 0f295a0..d290af2 100644
--- a/src/multilspy/language_servers/omnisharp/omnisharp.py
+++ b/src/multilspy/language_servers/omnisharp/omnisharp.py
@@ -77,7 +77,7 @@ class OmniSharp(LanguageServer):
                 "ascii",
                 "-z",
                 "-s",
-                slnfilename,
+                f'"{slnfilename}"',
                 "--hostPID",
                 str(os.getpid()),
                 "DotNet:enablePackageRestore=false",