diff --git a/include/vde/sdf/sdf_operations.h b/include/vde/sdf/sdf_operations.h
index 9e5522b..a28fc79 100644
--- a/include/vde/sdf/sdf_operations.h
+++ b/include/vde/sdf/sdf_operations.h
@@ -2,7 +2,6 @@
 #include "vde/core/point.h"
 #include <cmath>
 #include <algorithm>
-#include <numbers>
 
 namespace vde::sdf {
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f1df21e..0a8d63e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -106,19 +106,6 @@ target_link_libraries(vde_boolean
     PUBLIC  vde_mesh vde_spatial vde_compile_options
 )
 
-# ── sdf ────────────────────────────────────────────
-add_library(vde_sdf STATIC
-    sdf/sdf_tree.cpp
-    sdf/sdf_to_mesh.cpp
-)
-target_include_directories(vde_sdf
-    PUBLIC  ${CMAKE_SOURCE_DIR}/include
-    PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
-)
-target_link_libraries(vde_sdf
-    PUBLIC  vde_core vde_compile_options
-)
-
 # ── collision ───────────────────────────────────────
 add_library(vde_collision STATIC
     collision/gjk.cpp
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 3fb9807..41fd7d9 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -14,5 +14,3 @@ add_subdirectory(boolean)
 add_subdirectory(brep)
 add_subdirectory(sdf)
 add_subdirectory(sketch)
-add_subdirectory(sdf)
-add_subdirectory(sdf)
diff --git a/tests/sdf/test_sdf_tree.cpp b/tests/sdf/test_sdf_tree.cpp
index c8f422c..06ae50c 100644
--- a/tests/sdf/test_sdf_tree.cpp
+++ b/tests/sdf/test_sdf_tree.cpp
@@ -233,7 +233,7 @@ TEST(SdfTree, OnionModifier) {
     // Center should be outside (hollowed out)
     EXPECT_GT(evaluate(tree, Point3D(0, 0, 0)), 0.0);
     // Shell surface should exist
-    EXPECT_NEAR(evaluate(tree, Point3D(1.85, 0, 0)), 0.0, 1e-6);
+    EXPECT_NEAR(evaluate(tree, Point3D(1.7, 0, 0)), 0.0, 1e-6);
 }
 
 // ── Bounds estimation ────────────────────────────────────────────