diff --git a/main/webserver.cpp b/main/webserver.cpp
index 233a1f2..e9fe6e2 100644
--- a/main/webserver.cpp
+++ b/main/webserver.cpp
@@ -1,6 +1,8 @@
 #include "webserver.h"
 #include "sdkconfig.h"
 
+using namespace std::chrono_literals;
+
 #ifdef FEATURE_WEBSERVER
 namespace {
 constexpr const char * const TAG = "BOBBYWEB";
diff --git a/main/webserver_displaycontrol.cpp b/main/webserver_displaycontrol.cpp
index d7757b7..78f96f8 100644
--- a/main/webserver_displaycontrol.cpp
+++ b/main/webserver_displaycontrol.cpp
@@ -2,6 +2,7 @@
 
 #ifdef FEATURE_WEBSERVER
 using esphttpdutils::HtmlTag;
+using namespace std::chrono_literals;
 
 namespace {
 constexpr const char * const TAG = "BOBBYWEB";
diff --git a/main/webserver_dumpnvs.cpp b/main/webserver_dumpnvs.cpp
index 0e75496..8750640 100644
--- a/main/webserver_dumpnvs.cpp
+++ b/main/webserver_dumpnvs.cpp
@@ -2,6 +2,7 @@
 
 using esphttpdutils::HtmlTag;
 using namespace espchrono;
+using namespace std::chrono_literals;
 
 namespace {
 constexpr const char * const TAG = "BOBBYWEB";