diff --git a/keymaster/trusty_keymaster_device.cpp b/keymaster/trusty_keymaster_device.cpp
index 2afb1a9..e65982e 100644
--- a/keymaster/trusty_keymaster_device.cpp
+++ b/keymaster/trusty_keymaster_device.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "TrustyKeymaster"
 
 #include <assert.h>
+#include <errno.h>
 #include <openssl/evp.h>
 #include <openssl/x509.h>
 #include <stddef.h>