diff --git a/ext/nrf/cc310_glue.h b/ext/nrf/cc310_glue.h
index db34c34..37a0875 100644
--- a/ext/nrf/cc310_glue.h
+++ b/ext/nrf/cc310_glue.h
@@ -36,7 +36,7 @@
 
 static inline void nrf_cc310_disable(void)
 {
-    NRF_CRYPTOCELL->ENABLE=1;
+    NRF_CRYPTOCELL->ENABLE=0;
 }
 
 /* Enable and disable cc310 to reduce power consumption */