diff --git a/borg/crypto.pyx b/borg/crypto.pyx
index 8bee39fe4..16f1cda82 100644
--- a/borg/crypto.pyx
+++ b/borg/crypto.pyx
@@ -5,7 +5,7 @@ This could be replaced by PyCrypto maybe?
 from libc.stdlib cimport malloc, free
 from cpython.buffer cimport PyBUF_SIMPLE, PyObject_GetBuffer, PyBuffer_Release
 
-API_VERSION = 2
+API_VERSION = 3
 
 
 cdef extern from "openssl/rand.h":
diff --git a/borg/helpers.py b/borg/helpers.py
index 9259c8f81..fb61c49e5 100644
--- a/borg/helpers.py
+++ b/borg/helpers.py
@@ -79,7 +79,7 @@ def check_extension_modules():
         raise ExtensionModuleError
     if chunker.API_VERSION != 2:
         raise ExtensionModuleError
-    if crypto.API_VERSION != 2:
+    if crypto.API_VERSION != 3:
         raise ExtensionModuleError
     if platform.API_VERSION != 2:
         raise ExtensionModuleError