diff --git a/doc/examples/diff.cpp b/doc/examples/diff.cpp
index d81a58dbd..a377fc813 100644
--- a/doc/examples/diff.cpp
+++ b/doc/examples/diff.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/flatten.cpp b/doc/examples/flatten.cpp
index ace53a21b..e7b7ee879 100644
--- a/doc/examples/flatten.cpp
+++ b/doc/examples/flatten.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/from_cbor.cpp b/doc/examples/from_cbor.cpp
index 92b052256..fc44d4a5b 100644
--- a/doc/examples/from_cbor.cpp
+++ b/doc/examples/from_cbor.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/from_msgpack.cpp b/doc/examples/from_msgpack.cpp
index d275f13ac..7c4202c9e 100644
--- a/doc/examples/from_msgpack.cpp
+++ b/doc/examples/from_msgpack.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/meta.cpp b/doc/examples/meta.cpp
index 3a31ca24b..28c88b8d1 100644
--- a/doc/examples/meta.cpp
+++ b/doc/examples/meta.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/operator_deserialize.cpp b/doc/examples/operator_deserialize.cpp
index a43cdf0fb..06a98db96 100644
--- a/doc/examples/operator_deserialize.cpp
+++ b/doc/examples/operator_deserialize.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/operator_serialize.cpp b/doc/examples/operator_serialize.cpp
index c1568d99d..c3861b466 100644
--- a/doc/examples/operator_serialize.cpp
+++ b/doc/examples/operator_serialize.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/operatorarray__key_type.cpp b/doc/examples/operatorarray__key_type.cpp
index e83a2ac00..795abc089 100644
--- a/doc/examples/operatorarray__key_type.cpp
+++ b/doc/examples/operatorarray__key_type.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__array__parser_callback_t.cpp b/doc/examples/parse__array__parser_callback_t.cpp
index 8e086d200..68ecf602e 100644
--- a/doc/examples/parse__array__parser_callback_t.cpp
+++ b/doc/examples/parse__array__parser_callback_t.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__contiguouscontainer__parser_callback_t.cpp b/doc/examples/parse__contiguouscontainer__parser_callback_t.cpp
index 5a339079f..45e376d9a 100644
--- a/doc/examples/parse__contiguouscontainer__parser_callback_t.cpp
+++ b/doc/examples/parse__contiguouscontainer__parser_callback_t.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__istream__parser_callback_t.cpp b/doc/examples/parse__istream__parser_callback_t.cpp
index 6812a5e2e..b5f84da45 100644
--- a/doc/examples/parse__istream__parser_callback_t.cpp
+++ b/doc/examples/parse__istream__parser_callback_t.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__iteratortype__parser_callback_t.cpp b/doc/examples/parse__iteratortype__parser_callback_t.cpp
index 3f723c5fa..c7a5bf838 100644
--- a/doc/examples/parse__iteratortype__parser_callback_t.cpp
+++ b/doc/examples/parse__iteratortype__parser_callback_t.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/parse__string__parser_callback_t.cpp b/doc/examples/parse__string__parser_callback_t.cpp
index 0a4f3b539..bea4914f9 100644
--- a/doc/examples/parse__string__parser_callback_t.cpp
+++ b/doc/examples/parse__string__parser_callback_t.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/patch.cpp b/doc/examples/patch.cpp
index 24a52d596..4dfada32b 100644
--- a/doc/examples/patch.cpp
+++ b/doc/examples/patch.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/to_cbor.cpp b/doc/examples/to_cbor.cpp
index 21a5ce866..2d07e8abd 100644
--- a/doc/examples/to_cbor.cpp
+++ b/doc/examples/to_cbor.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/to_msgpack.cpp b/doc/examples/to_msgpack.cpp
index 21c8817a4..dad835429 100644
--- a/doc/examples/to_msgpack.cpp
+++ b/doc/examples/to_msgpack.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;
 
diff --git a/doc/examples/unflatten.cpp b/doc/examples/unflatten.cpp
index e2b9b6b86..a01a63499 100644
--- a/doc/examples/unflatten.cpp
+++ b/doc/examples/unflatten.cpp
@@ -1,4 +1,5 @@
 #include <json.hpp>
+#include <iomanip> // for std::setw
 
 using json = nlohmann::json;