diff --git a/lib/wrappers/openssl.nim b/lib/wrappers/openssl.nim
index 1bd02eaf02..5521476d91 100644
--- a/lib/wrappers/openssl.nim
+++ b/lib/wrappers/openssl.nim
@@ -293,6 +293,8 @@ proc SSL_get_error*(s: SslPtr, ret_code: cInt): cInt{.cdecl, dynlib: DLLSSLName,
 proc SSL_accept*(ssl: SslPtr): cInt{.cdecl, dynlib: DLLSSLName, importc.}
 proc SSL_pending*(ssl: SslPtr): cInt{.cdecl, dynlib: DLLSSLName, importc.}
 
+proc BIO_new_mem_buf*(data: pointer, len: cint): BIO{.cdecl,
+    dynlib: DLLSSLName, importc.}
 proc BIO_new_ssl_connect*(ctx: SslCtx): BIO{.cdecl,
     dynlib: DLLSSLName, importc.}
 proc BIO_ctrl*(bio: BIO, cmd: cint, larg: int, arg: cstring): int{.cdecl,