diff --git a/library/ssl_cache.c b/library/ssl_cache.c
index 456f41c..d198474 100644
--- a/library/ssl_cache.c
+++ b/library/ssl_cache.c
@@ -314,7 +314,7 @@
     if( session_serialized != NULL )
     {
         mbedtls_platform_zeroize( session_serialized, session_serialized_len );
-        mbedtls_free(session_serialized);
+        mbedtls_free( session_serialized );
         session_serialized = NULL;
     }