diff --git a/bob/learn/em/__init__.py b/bob/learn/em/__init__.py
index 62f331b0b27c688714bd5d689b31bc1261e6cfd2..0254819f86516f83b710f45adc8e21920b96dab6 100644
--- a/bob/learn/em/__init__.py
+++ b/bob/learn/em/__init__.py
@@ -2,6 +2,7 @@
 import bob.io.base
 import bob.math
 import bob.learn.linear
+import bob.sp
 
 # import our own Library
 import bob.extension