diff --git a/3party/opening_hours/parse_months.cpp b/3party/opening_hours/parse_months.cpp
index 12cde9eedf..df0f11f37b 100644
--- a/3party/opening_hours/parse_months.cpp
+++ b/3party/opening_hours/parse_months.cpp
@@ -2,7 +2,7 @@
 #include "opening_hours_parsers.hpp"
 
 #include <boost/spirit/include/phoenix_bind.hpp>
-#include <boost/spirit/include/phoenix_operator.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>  // operator,
 
 namespace osmoh
 {
diff --git a/3party/opening_hours/parse_opening_hours.cpp b/3party/opening_hours/parse_opening_hours.cpp
index fb7cdd14e2..4126b43001 100644
--- a/3party/opening_hours/parse_opening_hours.cpp
+++ b/3party/opening_hours/parse_opening_hours.cpp
@@ -2,7 +2,7 @@
 #include "opening_hours_parsers.hpp"
 
 #include <boost/spirit/include/phoenix_bind.hpp>
-#include <boost/spirit/include/phoenix_operator.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>  // operator,
 #include <boost/spirit/include/phoenix_stl.hpp>
 
 namespace osmoh
diff --git a/3party/opening_hours/parse_timespans.cpp b/3party/opening_hours/parse_timespans.cpp
index 0c1164bc3d..ff965dafb1 100644
--- a/3party/opening_hours/parse_timespans.cpp
+++ b/3party/opening_hours/parse_timespans.cpp
@@ -2,7 +2,7 @@
 #include "opening_hours_parsers.hpp"
 
 #include <boost/spirit/include/phoenix_bind.hpp>
-#include <boost/spirit/include/phoenix_operator.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>  // operator,
 
 
 namespace osmoh
diff --git a/3party/opening_hours/parse_weekdays.cpp b/3party/opening_hours/parse_weekdays.cpp
index cc66970afe..54bc1863cf 100644
--- a/3party/opening_hours/parse_weekdays.cpp
+++ b/3party/opening_hours/parse_weekdays.cpp
@@ -2,7 +2,7 @@
 #include "opening_hours_parsers.hpp"
 
 #include <boost/spirit/include/phoenix_bind.hpp>
-#include <boost/spirit/include/phoenix_operator.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>  // operator,
 
 namespace osmoh
 {
diff --git a/3party/opening_hours/parse_weeks.cpp b/3party/opening_hours/parse_weeks.cpp
index 43790e589a..7f0f8ef866 100644
--- a/3party/opening_hours/parse_weeks.cpp
+++ b/3party/opening_hours/parse_weeks.cpp
@@ -2,6 +2,7 @@
 #include "opening_hours_parsers.hpp"
 
 #include <boost/spirit/include/phoenix_bind.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>  // operator,
 
 namespace osmoh
 {
diff --git a/3party/opening_hours/parse_years.cpp b/3party/opening_hours/parse_years.cpp
index 6ed893db29..18e72e61cd 100644
--- a/3party/opening_hours/parse_years.cpp
+++ b/3party/opening_hours/parse_years.cpp
@@ -2,6 +2,7 @@
 #include "opening_hours_parsers.hpp"
 
 #include <boost/spirit/include/phoenix_bind.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>  // operator,
 
 namespace osmoh
 {