diff --git a/pkg/debuginfo/store.go b/pkg/debuginfo/store.go
index 55aed18022e..4c704778875 100644
--- a/pkg/debuginfo/store.go
+++ b/pkg/debuginfo/store.go
@@ -238,6 +238,9 @@ func (s *Store) InitiateUpload(ctx context.Context, req *debuginfopb.InitiateUpl
 	if req.Hash == "" {
 		return nil, status.Error(codes.InvalidArgument, "hash must be set")
 	}
+	if req.Size == 0 {
+		return nil, status.Error(codes.InvalidArgument, "size must be set")
+	}
 
 	// We don't want to blindly accept upload initiation requests that
 	// shouldn't have happened.
diff --git a/pkg/debuginfo/store_test.go b/pkg/debuginfo/store_test.go
index 99c71e024bd..2058467a94c 100644
--- a/pkg/debuginfo/store_test.go
+++ b/pkg/debuginfo/store_test.go
@@ -123,6 +123,7 @@ func TestStore(t *testing.T) {
 	_, err = debuginfoClient.InitiateUpload(ctx, &debuginfopb.InitiateUploadRequest{
 		BuildId: "abcd",
 		Hash:    "foo",
+		Size:    2,
 	})
 	require.NoError(t, err)
 
@@ -144,6 +145,7 @@ func TestStore(t *testing.T) {
 	initiateResp, err := debuginfoClient.InitiateUpload(ctx, &debuginfopb.InitiateUploadRequest{
 		BuildId: "abcd",
 		Hash:    "foo",
+		Size:    2,
 	})
 	require.NoError(t, err)
 
@@ -192,6 +194,7 @@ func TestStore(t *testing.T) {
 	_, err = debuginfoClient.InitiateUpload(ctx, &debuginfopb.InitiateUploadRequest{
 		BuildId: "abcd",
 		Hash:    "foo",
+		Size:    2,
 	})
 	require.EqualError(t, err, "rpc error: code = AlreadyExists desc = Debuginfo already exists and is marked as invalid, but the proposed hash is the same as the one already available, therefore the upload is not accepted as it would result in the same invalid debuginfos.")