diff --git a/examples/pdf-split-pages.cc b/examples/pdf-split-pages.cc
index aa089e5a..b6dd701b 100644
--- a/examples/pdf-split-pages.cc
+++ b/examples/pdf-split-pages.cc
@@ -8,9 +8,10 @@
 #include <qpdf/QPDFPageDocumentHelper.hh>
 #include <qpdf/QPDFWriter.hh>
 #include <qpdf/QUtil.hh>
-#include <string>
+
 #include <iostream>
-#include <cstdlib>
+#include <stdlib.h>
+#include <string>
 
 static char const* whoami = 0;
 static bool static_id = false;
diff --git a/ispell-words b/ispell-words
index 9d60b74d..ff0f3120 100644
--- a/ispell-words
+++ b/ispell-words
@@ -400,7 +400,6 @@ cso
 csoe
 css
 cstdio
-cstdlib
 cstr
 cstring
 ctest
diff --git a/libqpdf/Pl_DCT.cc b/libqpdf/Pl_DCT.cc
index 8e1a5177..ceecc518 100644
--- a/libqpdf/Pl_DCT.cc
+++ b/libqpdf/Pl_DCT.cc
@@ -2,10 +2,11 @@
 
 #include <qpdf/QUtil.hh>
 #include <qpdf/QTC.hh>
+
 #include <setjmp.h>
-#include <string>
 #include <stdexcept>
-#include <cstdlib>
+#include <stdlib.h>
+#include <string>
 
 #if BITS_IN_JSAMPLE != 8
 # error "qpdf does not support libjpeg built with BITS_IN_JSAMPLE != 8"
diff --git a/libqpdf/QPDF.cc b/libqpdf/QPDF.cc
index e9d0b77a..61fd7920 100644
--- a/libqpdf/QPDF.cc
+++ b/libqpdf/QPDF.cc
@@ -4,6 +4,7 @@
 #include <vector>
 #include <map>
 #include <algorithm>
+#include <stdlib.h>
 #include <string.h>
 #include <memory.h>
 
diff --git a/libqpdf/QPDFTokenizer.cc b/libqpdf/QPDFTokenizer.cc
index 80fcf347..ff5ebe15 100644
--- a/libqpdf/QPDFTokenizer.cc
+++ b/libqpdf/QPDFTokenizer.cc
@@ -10,8 +10,8 @@
 #include <qpdf/QPDFObjectHandle.hh>
 
 #include <stdexcept>
+#include <stdlib.h>
 #include <string.h>
-#include <cstdlib>
 
 static bool is_delimiter(char ch)
 {