diff --git a/websocketpp/extensions/permessage_deflate/enabled.hpp b/websocketpp/extensions/permessage_deflate/enabled.hpp
index e4a44c933a..909f6040dd 100644
--- a/websocketpp/extensions/permessage_deflate/enabled.hpp
+++ b/websocketpp/extensions/permessage_deflate/enabled.hpp
@@ -494,13 +494,11 @@ public:
         m_dstate.next_in = (unsigned char *)(const_cast<char *>(in.data()));
 
         do {
-            int ret;
-            
             // Output to local buffer
             m_dstate.avail_out = m_compress_buffer_size;
             m_dstate.next_out = m_compress_buffer.get();
 
-            ret = deflate(&m_dstate, Z_SYNC_FLUSH);
+            deflate(&m_dstate, Z_SYNC_FLUSH);
 
             output = m_compress_buffer_size - m_dstate.avail_out;