diff --git a/src/wifi/model/aparf-wifi-manager.cc b/src/wifi/model/aparf-wifi-manager.cc
index 36f179532..b2eb99b35 100644
--- a/src/wifi/model/aparf-wifi-manager.cc
+++ b/src/wifi/model/aparf-wifi-manager.cc
@@ -86,12 +86,12 @@ AparfWifiManager::GetTypeId (void)
                    "Step size for decrement the power.",
                    UintegerValue (1),
                    MakeUintegerAccessor (&AparfWifiManager::m_powerDec),
-                   MakeUintegerChecker<uint32_t> ())
+                   MakeUintegerChecker<uint8_t> ())
     .AddAttribute ("PowerIncrementStep",
                    "Step size for increment the power.",
                    UintegerValue (1),
                    MakeUintegerAccessor (&AparfWifiManager::m_powerInc),
-                   MakeUintegerChecker<uint32_t> ())
+                   MakeUintegerChecker<uint8_t> ())
     .AddAttribute ("RateDecrementStep",
                    "Step size for decrement the rate.",
                    UintegerValue (1),
diff --git a/src/wifi/model/aparf-wifi-manager.h b/src/wifi/model/aparf-wifi-manager.h
index 39b632626..aa2e4a872 100644
--- a/src/wifi/model/aparf-wifi-manager.h
+++ b/src/wifi/model/aparf-wifi-manager.h
@@ -97,8 +97,8 @@ private:
   uint32_t m_succesMax2; //!< The minimum number of successful transmissions in \"Low\" state to try a new power or rate.
   uint32_t m_failMax;    //!< The minimum number of failed transmissions to try a new power or rate.
   uint32_t m_powerMax;   //!< The maximum number of power changes.
-  uint32_t m_powerInc;   //!< Step size for increment the power.
-  uint32_t m_powerDec;   //!< Step size for decrement the power.
+  uint8_t m_powerInc;    //!< Step size for increment the power.
+  uint8_t m_powerDec;    //!< Step size for decrement the power.
   uint32_t m_rateInc;    //!< Step size for increment the rate.
   uint32_t m_rateDec;    //!< Step size for decrement the rate.
 
@@ -107,12 +107,12 @@ private:
    * Differently form rate, power levels do not depend on the remote station.
    * The levels depend only on the physical layer of the device.
    */
-  uint32_t m_minPower;
+  uint8_t m_minPower;
 
   /**
    * Maximal power level.
    */
-  uint32_t m_maxPower;
+  uint8_t m_maxPower;
 
   /**
    * The trace source fired when the transmission power changes.
diff --git a/src/wifi/model/minstrel-wifi-manager.cc b/src/wifi/model/minstrel-wifi-manager.cc
index 727a9ba4c..6efbc43e9 100644
--- a/src/wifi/model/minstrel-wifi-manager.cc
+++ b/src/wifi/model/minstrel-wifi-manager.cc
@@ -1070,7 +1070,7 @@ MinstrelWifiManager::PrintTable (MinstrelWifiRemoteStation *station)
           station->m_statsFile << ' ';
         }
 
-      float tmpTh = rate.throughput / 100000.0;
+      float tmpTh = rate.throughput / 100000.0f;
       station->m_statsFile << "   " <<
         std::setw (17) << GetSupported (station, i) << "  " <<
         std::setw (2) << i << "  " <<
diff --git a/src/wifi/model/parf-wifi-manager.h b/src/wifi/model/parf-wifi-manager.h
index bd0a83d31..f9e8a32f5 100644
--- a/src/wifi/model/parf-wifi-manager.h
+++ b/src/wifi/model/parf-wifi-manager.h
@@ -89,12 +89,12 @@ private:
    * In contrast to rate, power levels do not depend on the remote station.
    * The levels depend only on the physical layer of the device.
    */
-  uint32_t m_minPower;
+  uint8_t m_minPower;
 
   /**
    * Maximal power level.
    */
-  uint32_t m_maxPower;
+  uint8_t m_maxPower;
 
   /**
    * The trace source fired when the transmission power changes.
diff --git a/src/wifi/model/rrpaa-wifi-manager.h b/src/wifi/model/rrpaa-wifi-manager.h
index 06f78f8da..82a9bb79d 100644
--- a/src/wifi/model/rrpaa-wifi-manager.h
+++ b/src/wifi/model/rrpaa-wifi-manager.h
@@ -218,9 +218,9 @@ private:
    * Differently form rate, power levels do not depend on the remote station.
    * The levels depend only on the physical layer of the device.
    */
-  uint32_t m_minPowerLevel;     //!< Minimal power level.
-  uint32_t m_maxPowerLevel;     //!< Maximal power level.
-  uint32_t m_nPowerLevels;      //!< Number of power levels.
+  uint8_t m_minPowerLevel;     //!< Minimal power level.
+  uint8_t m_maxPowerLevel;     //!< Maximal power level.
+  uint8_t m_nPowerLevels;      //!< Number of power levels.
 
   /**
    * The trace source fired when the transmission power change