diff --git a/error.c b/error.c
index 01fb7912..e3947a2f 100644
--- a/error.c
+++ b/error.c
@@ -69,12 +69,18 @@ SR_API const char *sr_strerror(int error_code)
 	case SR_ERR_MALLOC:
 		str = "memory allocation error";
 		break;
+	case SR_ERR_ARG:
+		str = "invalid argument";
+		break;
 	case SR_ERR_BUG:
 		str = "internal error";
 		break;
 	case SR_ERR_SAMPLERATE:
 		str = "invalid samplerate";
 		break;
+	case SR_ERR_NA:
+		str = "not applicable";
+		break;
 	default:
 		str = "unknown error";
 		break;
@@ -120,12 +126,18 @@ SR_API const char *sr_strerror_name(int error_code)
 	case SR_ERR_MALLOC:
 		str = "SR_ERR_MALLOC";
 		break;
+	case SR_ERR_ARG:
+		str = "SR_ERR_ARG";
+		break;
 	case SR_ERR_BUG:
 		str = "SR_ERR_BUG";
 		break;
 	case SR_ERR_SAMPLERATE:
 		str = "SR_ERR_SAMPLERATE";
 		break;
+	case SR_ERR_NA:
+		str = "SR_ERR_NA";
+		break;
 	default:
 		str = "unknown error code";
 		break;