diff --git a/CHANGELOG.md b/CHANGELOG.md
index e287234..7790aee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Unreleased
 
 - Remove assertion when trying to re-enable active mode
+- Fix type missmatch for set_opts functions
 
 # v9.0.0-rc1
 
diff --git a/src/glisten_ssl_ffi.erl b/src/glisten_ssl_ffi.erl
index 066e3ee..d87cfbc 100644
--- a/src/glisten_ssl_ffi.erl
+++ b/src/glisten_ssl_ffi.erl
@@ -15,8 +15,8 @@ set_opts(Socket, Options) ->
   case ssl:setopts(Socket, Options) of
     ok ->
       {ok, nil};
-    {error, Reason} ->
-      {error, Reason}
+    {error, _Reason} ->
+      {error, nil}
   end.
 
 controlling_process(Socket, Pid) ->
diff --git a/src/glisten_tcp_ffi.erl b/src/glisten_tcp_ffi.erl
index f4a2005..1130c49 100644
--- a/src/glisten_tcp_ffi.erl
+++ b/src/glisten_tcp_ffi.erl
@@ -14,8 +14,8 @@ set_opts(Socket, Options) ->
   case inet:setopts(Socket, Options) of
     ok ->
       {ok, nil};
-    {error, Reason} ->
-      {error, Reason}
+    {error, _Reason} ->
+      {error, nil}
   end.
 
 controlling_process(Socket, Pid) ->