diff --git a/src/deflatehd.cc b/src/deflatehd.cc
index a9086b28..2db89814 100644
--- a/src/deflatehd.cc
+++ b/src/deflatehd.cc
@@ -373,7 +373,7 @@ OPTIONS:
             << std::endl;
 }
 
-static struct option long_options[] = {
+constexpr static struct option long_options[] = {
     {"http1text", no_argument, nullptr, 't'},
     {"table-size", required_argument, nullptr, 's'},
     {"deflate-table-size", required_argument, nullptr, 'S'},
diff --git a/src/h2load.cc b/src/h2load.cc
index 5f0558dd..e7840d25 100644
--- a/src/h2load.cc
+++ b/src/h2load.cc
@@ -1839,7 +1839,7 @@ int main(int argc, char **argv) {
   bool nreqs_set_manually = false;
   while (1) {
     static int flag = 0;
-    static option long_options[] = {
+    constexpr static option long_options[] = {
         {"requests", required_argument, nullptr, 'n'},
         {"clients", required_argument, nullptr, 'c'},
         {"data", required_argument, nullptr, 'd'},
diff --git a/src/inflatehd.cc b/src/inflatehd.cc
index 7945a0b2..9140e054 100644
--- a/src/inflatehd.cc
+++ b/src/inflatehd.cc
@@ -251,7 +251,7 @@ OPTIONS:
   ;
 }
 
-static struct option long_options[] = {
+constexpr static struct option long_options[] = {
     {"dump-header-table", no_argument, nullptr, 'd'}, {nullptr, 0, nullptr, 0}};
 
 int main(int argc, char **argv) {
diff --git a/src/nghttp.cc b/src/nghttp.cc
index badbc9ca..f9ba6ce8 100644
--- a/src/nghttp.cc
+++ b/src/nghttp.cc
@@ -2680,7 +2680,7 @@ int main(int argc, char **argv) {
   bool color = false;
   while (1) {
     static int flag = 0;
-    static option long_options[] = {
+    constexpr static option long_options[] = {
         {"verbose", no_argument, nullptr, 'v'},
         {"null-out", no_argument, nullptr, 'n'},
         {"remote-name", no_argument, nullptr, 'O'},
diff --git a/src/nghttpd.cc b/src/nghttpd.cc
index 43c7e0ba..6080037b 100644
--- a/src/nghttpd.cc
+++ b/src/nghttpd.cc
@@ -202,7 +202,7 @@ int main(int argc, char **argv) {
 
   while (1) {
     static int flag = 0;
-    static option long_options[] = {
+    constexpr static option long_options[] = {
         {"address", required_argument, nullptr, 'a'},
         {"daemon", no_argument, nullptr, 'D'},
         {"htdocs", required_argument, nullptr, 'd'},