diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 746f0658..f6e17d67 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Changelog
 All changes to this project will be documented in this file.
 
+## [9.5.8] - 2020-05-08
+
+(openssl tls) (openssl < 1.1) logic inversion - crypto locking callback are not registered properly
+
 ## [9.5.7] - 2020-05-08
 
 (cmake) default TLS back to mbedtls on Windows Universal Platform
diff --git a/ixwebsocket/IXSocketOpenSSL.cpp b/ixwebsocket/IXSocketOpenSSL.cpp
index b678397a..a504a5cb 100644
--- a/ixwebsocket/IXSocketOpenSSL.cpp
+++ b/ixwebsocket/IXSocketOpenSSL.cpp
@@ -109,7 +109,7 @@ namespace ix
 #else
         (void) OPENSSL_config(nullptr);
 
-        if (CRYPTO_get_locking_callback() != nullptr)
+        if (CRYPTO_get_locking_callback() == nullptr)
         {
             CRYPTO_set_locking_callback(SocketOpenSSL::openSSLLockingCallback);
         }
diff --git a/ixwebsocket/IXWebSocketVersion.h b/ixwebsocket/IXWebSocketVersion.h
index cc4b859a..dc2d0282 100644
--- a/ixwebsocket/IXWebSocketVersion.h
+++ b/ixwebsocket/IXWebSocketVersion.h
@@ -6,4 +6,4 @@
 
 #pragma once
 
-#define IX_WEBSOCKET_VERSION "9.5.7"
+#define IX_WEBSOCKET_VERSION "9.5.8"