diff --git a/src/config_build.h b/src/config_build.h
index afafb86f4..f4204016c 100644
--- a/src/config_build.h
+++ b/src/config_build.h
@@ -55,13 +55,13 @@
 //**********************************************************************
 //**** Compile options
 
-#include <sys/types.h>
-#include <iostream>
-#include <cstdlib>
 #include <cstdio>
+#include <cstdlib>
 #include <cstring>
-#include <string>
 #include <iostream>
+#include <string>
+
+#include <sys/types.h>
 
 // Avoid needing std:: prefixes on some very common items
 using string = std::string;