diff --git a/code/Common/Compression.h b/code/Common/Compression.h
index 20c92cb60..545b4b41d 100644
--- a/code/Common/Compression.h
+++ b/code/Common/Compression.h
@@ -42,6 +42,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #pragma once
 
 #include <vector>
+#include <cstddef> // size_t
 
 namespace Assimp {