diff --git a/src/error.rs b/src/error.rs
index 2f66afb2..efdc6484 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -166,6 +166,7 @@ fn internal_desc(error: Error) -> Option<&'static str> {
     match error {
         Error::UNSUPPORTED => Some("getrandom: this target is not supported"),
         Error::ERRNO_NOT_POSITIVE => Some("errno: did not return a positive value"),
+        Error::UNEXPECTED => Some("unexpected situation"),
         Error::IOS_SEC_RANDOM => Some("SecRandomCopyBytes: iOS Security framework failure"),
         Error::WINDOWS_RTL_GEN_RANDOM => Some("RtlGenRandom: Windows system function failure"),
         Error::FAILED_RDRAND => Some("RDRAND: failed multiple times: CPU issue likely"),