diff --git a/src/libopensc/errors.c b/src/libopensc/errors.c
index eb41ec56..e83f623e 100644
--- a/src/libopensc/errors.c
+++ b/src/libopensc/errors.c
@@ -90,6 +90,7 @@ const char *sc_strerror(int error)
 		"Key length/algorithm not supported by card",
 		"No default (transport) key available",
 		"The PKCS#15 Key/certificate ID specified is not unique",
+		"Unable to load key and certificate(s) from file",
 	};
 	const int p15i_base = -SC_ERROR_PKCS15INIT;
 	const char *misc_errors[] = {
diff --git a/src/libopensc/errors.h b/src/libopensc/errors.h
index 474d6fad..c3aa158b 100644
--- a/src/libopensc/errors.h
+++ b/src/libopensc/errors.h
@@ -92,6 +92,7 @@ extern "C" {
 #define SC_ERROR_INCOMPATIBLE_KEY		-1503
 #define SC_ERROR_NO_DEFAULT_KEY			-1504
 #define SC_ERROR_ID_NOT_UNIQUE			-1505
+#define SC_ERROR_CANNOT_LOAD_KEY		-1006
 
 /* Errors that do not fit the categories above */
 #define SC_ERROR_UNKNOWN			-1900