diff --git a/pcsc.c b/pcsc.c
index fa9f2b8..5d6f7d8 100644
--- a/pcsc.c
+++ b/pcsc.c
@@ -370,8 +370,8 @@ static char* php_pcsc_error_to_string(DWORD dwRC) {
 		case SCARD_E_SHARING_VIOLATION: return "SCARD_E_SHARING_VIOLATION";
 		case SCARD_E_SYSTEM_CANCELLED: return "SCARD_E_SYSTEM_CANCELLED";
 		case SCARD_E_TIMEOUT: return "SCARD_E_TIMEOUT";
-#ifdef SCARD_E_SERVER_TOO_BUSY
-		case SCARD_E_SERVER_TOO_BUSY: return "SCARD_E_UNEXPECTED";
+#ifdef SCARD_E_UNEXPECTED
+		case SCARD_E_UNEXPECTED: return "SCARD_E_UNEXPECTED";
 #endif
 		case SCARD_E_UNKNOWN_CARD: return "SCARD_E_UNKNOWN_CARD";
 		case SCARD_E_UNKNOWN_READER: return "SCARD_E_UNKNOWN_READER";