diff --git a/src/wifi/CMakeLists.txt b/src/wifi/CMakeLists.txt
index 54a0079de..f3a2068cc 100644
--- a/src/wifi/CMakeLists.txt
+++ b/src/wifi/CMakeLists.txt
@@ -151,6 +151,7 @@ set(source_files
     model/wifi-remote-station-manager.cc
     model/wifi-spectrum-phy-interface.cc
     model/wifi-spectrum-signal-parameters.cc
+    model/wifi-standards.cc
     model/wifi-tx-current-model.cc
     model/wifi-tx-parameters.cc
     model/wifi-tx-timer.cc
diff --git a/src/wifi/model/wifi-standards.cc b/src/wifi/model/wifi-standards.cc
new file mode 100644
index 000000000..29b182f78
--- /dev/null
+++ b/src/wifi/model/wifi-standards.cc
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2007 INRIA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ */
+
+#include "wifi-standards.h"
+
+namespace ns3
+{
+
+const std::map<WifiStandard, std::list<WifiPhyBand>> wifiStandards = {
+    {WIFI_STANDARD_80211a, {WIFI_PHY_BAND_5GHZ}},
+    {WIFI_STANDARD_80211b, {WIFI_PHY_BAND_2_4GHZ}},
+    {WIFI_STANDARD_80211g, {WIFI_PHY_BAND_2_4GHZ}},
+    {WIFI_STANDARD_80211p, {WIFI_PHY_BAND_5GHZ}},
+    {WIFI_STANDARD_80211n, {WIFI_PHY_BAND_2_4GHZ, WIFI_PHY_BAND_5GHZ}},
+    {WIFI_STANDARD_80211ac, {WIFI_PHY_BAND_5GHZ}},
+    {WIFI_STANDARD_80211ad, {WIFI_PHY_BAND_60GHZ}},
+    {WIFI_STANDARD_80211ax, {WIFI_PHY_BAND_2_4GHZ, WIFI_PHY_BAND_5GHZ, WIFI_PHY_BAND_6GHZ}},
+    {WIFI_STANDARD_80211be, {WIFI_PHY_BAND_2_4GHZ, WIFI_PHY_BAND_5GHZ, WIFI_PHY_BAND_6GHZ}},
+};
+
+} // namespace ns3
diff --git a/src/wifi/model/wifi-standards.h b/src/wifi/model/wifi-standards.h
index 9227d4348..e5de37157 100644
--- a/src/wifi/model/wifi-standards.h
+++ b/src/wifi/model/wifi-standards.h
@@ -86,17 +86,7 @@ operator<<(std::ostream& os, WifiStandard standard)
 /**
  * \brief map a given standard configured by the user to the allowed PHY bands
  */
-const std::map<WifiStandard, std::list<WifiPhyBand>> wifiStandards = {
-    {WIFI_STANDARD_80211a, {WIFI_PHY_BAND_5GHZ}},
-    {WIFI_STANDARD_80211b, {WIFI_PHY_BAND_2_4GHZ}},
-    {WIFI_STANDARD_80211g, {WIFI_PHY_BAND_2_4GHZ}},
-    {WIFI_STANDARD_80211p, {WIFI_PHY_BAND_5GHZ}},
-    {WIFI_STANDARD_80211n, {WIFI_PHY_BAND_2_4GHZ, WIFI_PHY_BAND_5GHZ}},
-    {WIFI_STANDARD_80211ac, {WIFI_PHY_BAND_5GHZ}},
-    {WIFI_STANDARD_80211ad, {WIFI_PHY_BAND_60GHZ}},
-    {WIFI_STANDARD_80211ax, {WIFI_PHY_BAND_2_4GHZ, WIFI_PHY_BAND_5GHZ, WIFI_PHY_BAND_6GHZ}},
-    {WIFI_STANDARD_80211be, {WIFI_PHY_BAND_2_4GHZ, WIFI_PHY_BAND_5GHZ, WIFI_PHY_BAND_6GHZ}},
-};
+extern const std::map<WifiStandard, std::list<WifiPhyBand>> wifiStandards;
 
 /**
  * \ingroup wifi
diff --git a/src/wifi/model/wifi-utils.cc b/src/wifi/model/wifi-utils.cc
index 10721c0af..eff922bc2 100644
--- a/src/wifi/model/wifi-utils.cc
+++ b/src/wifi/model/wifi-utils.cc
@@ -30,6 +30,8 @@
 namespace ns3
 {
 
+const Time WIFI_TU = MicroSeconds(1024);
+
 double
 DbToRatio(double dB)
 {
diff --git a/src/wifi/model/wifi-utils.h b/src/wifi/model/wifi-utils.h
index 9f98c05a1..0d01203a6 100644
--- a/src/wifi/model/wifi-utils.h
+++ b/src/wifi/model/wifi-utils.h
@@ -196,7 +196,7 @@ static constexpr uint8_t SINGLE_LINK_OP_ID = 0;
 static constexpr uint8_t WIFI_LINKID_UNDEFINED = 0xff;
 
 /// Wi-Fi Time Unit (see IEEE 802.11-2020 sec. 3.1)
-static const Time WIFI_TU = MicroSeconds(1024);
+extern const Time WIFI_TU;
 
 } // namespace ns3