diff --git a/src/clustering.cpp b/src/clustering.cpp
index 0ad4572..87147e6 100644
--- a/src/clustering.cpp
+++ b/src/clustering.cpp
@@ -3,7 +3,6 @@
 #include <cstddef>
 #include <cstdint>
 #include <limits>
-#include <omp.h>
 #include <vector>
 
 #include <nanobind/nanobind.h>
@@ -13,6 +12,10 @@
 
 #include "array_support.h"
 
+#if !defined(__APPLE__)
+#include <omp.h>
+#endif
+
 #if defined(__linux__) || defined(__APPLE__)
 typedef int64_t vtk_int;
 #else