diff --git a/decompiler/level_extractor/extract_common.cpp b/decompiler/level_extractor/extract_common.cpp
index 7a4d4b82c2..8ff25b07f1 100644
--- a/decompiler/level_extractor/extract_common.cpp
+++ b/decompiler/level_extractor/extract_common.cpp
@@ -1,3 +1,4 @@
+#include <cstddef>
 #include "extract_common.h"
 
 u32 clean_up_vertex_indices(std::vector<u32>& idx) {