diff --git a/external/PackedCSparse/FloatArray.h b/external/PackedCSparse/FloatArray.h
index 28d1c5da6..a85f56fd3 100644
--- a/external/PackedCSparse/FloatArray.h
+++ b/external/PackedCSparse/FloatArray.h
@@ -8,7 +8,6 @@
 //(https://github.com/ConstrainedSampler/PolytopeSamplerMatlab/blob/master/code/solver/PackedCSparse/PackedChol.h) by Ioannis Iakovidis
 
 #pragma once
-#include <immintrin.h>
 #include <random>
 #include <type_traits>
 namespace PackedCSparse {