diff --git a/src/sampled_values/sv_publisher.c b/src/sampled_values/sv_publisher.c
index d5ee8d05..02dfee64 100644
--- a/src/sampled_values/sv_publisher.c
+++ b/src/sampled_values/sv_publisher.c
@@ -367,7 +367,7 @@ SVPublisher_ASDU_getEncodedSize(SVPublisher_ASDU self)
         encodedSize += 4;
 
     /* sample */
-    encodedSize += 2;
+    encodedSize += (1 + BerEncoder_determineLengthSize(self->dataSize));
     encodedSize += self->dataSize;
 
     /* smpMod */