diff --git a/src/sf_define.h b/src/sf_define.h
index 58c04cd..bac72fe 100644
--- a/src/sf_define.h
+++ b/src/sf_define.h
@@ -58,6 +58,7 @@
 #define SF_ERROR_EINVAL       8822
 #define SF_ERROR_EAGAIN       8835
 #define SF_ERROR_EOVERFLOW    8884
+#define SF_ERROR_EOPNOTSUPP   8895
 
 #define SF_FORCE_CLOSE_CONNECTION_ERROR_MIN  SF_RETRIABLE_ERROR_NOT_MASTER
 #define SF_FORCE_CLOSE_CONNECTION_ERROR_MAX  SF_RETRIABLE_ERROR_MAX
diff --git a/src/sf_util.h b/src/sf_util.h
index 1d093d6..7ede9ff 100644
--- a/src/sf_util.h
+++ b/src/sf_util.h
@@ -101,6 +101,8 @@ static inline int sf_unify_errno(const int errnum)
             return SF_ERROR_EAGAIN;
         case EOVERFLOW:
             return SF_ERROR_EOVERFLOW;
+        case EOPNOTSUPP:
+            return SF_ERROR_EOPNOTSUPP;
         default:
             return errnum;
     }
@@ -117,6 +119,8 @@ static inline int sf_localize_errno(const int errnum)
             return EAGAIN;
         case SF_ERROR_EOVERFLOW:
             return EOVERFLOW;
+        case SF_ERROR_EOPNOTSUPP:
+            return EOPNOTSUPP;
         default:
             return errnum;
     }