diff --git a/src/wifi/helper/wifi-helper.cc b/src/wifi/helper/wifi-helper.cc
index 2038a0fb7..03d1c5b86 100644
--- a/src/wifi/helper/wifi-helper.cc
+++ b/src/wifi/helper/wifi-helper.cc
@@ -201,7 +201,7 @@ WifiPhyHelper::PcapSniffTxEvent (
 
         header.SetFrameFlags (frameFlags);
 
-        uint32_t rate = 0;
+        uint64_t rate = 0;
         if (txVector.GetMode ().GetModulationClass () != WIFI_MOD_CLASS_HT && txVector.GetMode ().GetModulationClass () != WIFI_MOD_CLASS_VHT && txVector.GetMode ().GetModulationClass () != WIFI_MOD_CLASS_HE)
           {
             rate = txVector.GetMode ().GetDataRate (txVector.GetChannelWidth (), txVector.GetGuardInterval (), 1) * txVector.GetNss () / 500000;
@@ -395,7 +395,7 @@ WifiPhyHelper::PcapSniffRxEvent (
 
         header.SetFrameFlags (frameFlags);
 
-        uint32_t rate = 0;
+        uint64_t rate = 0;
         if (txVector.GetMode ().GetModulationClass () != WIFI_MOD_CLASS_HT && txVector.GetMode ().GetModulationClass () != WIFI_MOD_CLASS_VHT && txVector.GetMode ().GetModulationClass () != WIFI_MOD_CLASS_HE)
           {
             rate = txVector.GetMode ().GetDataRate (txVector.GetChannelWidth (), txVector.GetGuardInterval (), 1) * txVector.GetNss () / 500000;
diff --git a/src/wifi/test/wifi-error-rate-models-test.cc b/src/wifi/test/wifi-error-rate-models-test.cc
index cbd7e71be..a73714115 100644
--- a/src/wifi/test/wifi-error-rate-models-test.cc
+++ b/src/wifi/test/wifi-error-rate-models-test.cc
@@ -66,7 +66,7 @@ WifiErrorRateModelsTestCaseDsss::DoRun (void)
 {
 
   // 1024 bytes plus headers
-  uint32_t size = (1024 + 40 + 14) * 8;
+  uint64_t size = (1024 + 40 + 14) * 8;
   // Spot test some values returned from DsssErrorRateModel
   // Values taken from sample 80211b.c program used in validation paper
   double value;