diff --git a/include/ceres/autodiff_manifold.h b/include/ceres/autodiff_manifold.h
index b2f5c9d..8a7601f 100644
--- a/include/ceres/autodiff_manifold.h
+++ b/include/ceres/autodiff_manifold.h
@@ -249,7 +249,7 @@
       internal::StaticParameterDims<kAmbientSize, kAmbientSize>>(
       internal::MinusWrapper<Functor>(*functor_),
       parameter_ptrs,
-      kAmbientSize,
+      kTangentSize,
       y_minus_x,
       jacobian_ptrs);
 }