diff --git a/src/brush.cpp b/src/brush.cpp
index 204ace1..f6a05d1 100644
--- a/src/brush.cpp
+++ b/src/brush.cpp
@@ -260,6 +260,7 @@ void Stroke::add_point(glm::vec3 pos, float pressure)
     kp.dist = 0;
     m_keypoints.push_back(kp);
 
+    m_interp_main.spacing = m_step;
     m_interp_main.add(kp);
     m_interp_dir.add(kp);
 }