diff --git a/src/Messages/OWSCallAnswerMessage.m b/src/Messages/OWSCallAnswerMessage.m
index 976288952..d18687a4b 100644
--- a/src/Messages/OWSCallAnswerMessage.m
+++ b/src/Messages/OWSCallAnswerMessage.m
@@ -26,7 +26,7 @@ NS_ASSUME_NONNULL_BEGIN
     OWSSignalServiceProtosCallMessageAnswerBuilder *builder = [OWSSignalServiceProtosCallMessageAnswerBuilder new];
 
     builder.id = self.callId;
-    builder.sessionDescription = self.sessionDescription;
+    [builder setDescription:self.sessionDescription];
 
     return [builder build];
 }
diff --git a/src/Messages/OWSCallOfferMessage.m b/src/Messages/OWSCallOfferMessage.m
index 17b741897..c8d4df15e 100644
--- a/src/Messages/OWSCallOfferMessage.m
+++ b/src/Messages/OWSCallOfferMessage.m
@@ -26,7 +26,7 @@ NS_ASSUME_NONNULL_BEGIN
     OWSSignalServiceProtosCallMessageOfferBuilder *builder = [OWSSignalServiceProtosCallMessageOfferBuilder new];
 
     builder.id = self.callId;
-    builder.sessionDescription = self.sessionDescription;
+    [builder setDescription:self.sessionDescription];
 
     return [builder build];
 }