diff --git a/OMPStream.cpp b/OMPStream.cpp
index 8063987..0cd8035 100644
--- a/OMPStream.cpp
+++ b/OMPStream.cpp
@@ -5,6 +5,7 @@
 // For full license terms please see the LICENSE file distributed with this
 // source code
 
+#include <cstdlib>  // For aligned_alloc
 #include "OMPStream.h"
 
 #ifndef ALIGNMENT
diff --git a/RAJAStream.cpp b/RAJAStream.cpp
index 44db5ed..d271ea4 100644
--- a/RAJAStream.cpp
+++ b/RAJAStream.cpp
@@ -5,6 +5,7 @@
 // For full license terms please see the LICENSE file distributed with this
 // source code
 
+#include <cstdlib>  // For aligned_alloc
 #include <stdexcept>
 #include "RAJAStream.hpp"