diff --git a/DataStructures/DeallocatingVector.h b/DataStructures/DeallocatingVector.h
index 89d8e2ce7..060fda0b9 100644
--- a/DataStructures/DeallocatingVector.h
+++ b/DataStructures/DeallocatingVector.h
@@ -22,6 +22,7 @@ or see http://www.gnu.org/licenses/agpl.txt.
 #define DEALLOCATINGVECTOR_H_
 
 #include <cassert>
+#include <cstring>
 #include <vector>
 
 #if __cplusplus > 199711L