diff --git a/src/aal/aal_arm.h b/src/aal/aal_arm.h
index bd5f08b..56cdbd6 100644
--- a/src/aal/aal_arm.h
+++ b/src/aal/aal_arm.h
@@ -12,7 +12,7 @@
 #  endif
 #endif
 
-#include <iostream>
+#include <cstddef>
 namespace snmalloc
 {
   /**