diff --git a/server/operators/sf3d/run.py b/server/operators/sf3d/run.py
index 9ec767e..f95bd6f 100644
--- a/server/operators/sf3d/run.py
+++ b/server/operators/sf3d/run.py
@@ -36,6 +36,14 @@ cmd = [
 ]
 env = os.environ.copy()
 env["PYTORCH_ENABLE_MPS_FALLBACK"] = "1"
+# torch and the compiled texture_baker/uv_unwrapper each link a libomp. Allowing
+# the duplicate runtime avoids "OMP: Error #15", but the duplicate then corrupts
+# the multithreaded CPU LAPACK call (torch.linalg.svd MPS fallback) and segfaults
+# — forcing single-threaded OpenMP removes the threading collision. Verified: a
+# clean GLB on M3 Ultra with all three set.
+env["KMP_DUPLICATE_LIB_OK"] = "TRUE"
+env["OMP_NUM_THREADS"] = "1"
+env["MKL_NUM_THREADS"] = "1"
 print("+", " ".join(cmd), flush=True)
 res = subprocess.run(cmd, cwd=str(VENDOR), env=env, stdout=sys.stdout, stderr=subprocess.STDOUT)
 if res.returncode != 0: