diff --git a/CHANGES.md b/CHANGES.md
index f140090ee..553f152dc 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -23,7 +23,8 @@ Changes from ns-3.37 to ns-3.38
 ### Changes to existing API
 
 * (network) **Ipv4Address** and **Ipv6Address** now do not raise an exception if built from an invalid string. Instead the address is marked as not initialized.
-* (internet) TCP Westwood model has been removed due to a bug in BW estimation documented in https://gitlab.com/nsnam/ns-3-dev/-/issues/579. The TCP Westwood+ model is now named **TcpWestwoodPlus** and can be instantiated like all the other TCP flavors.
+* (internet) TCP Westwood model has been removed due to a bug in BW estimation documented in <https://gitlab.com/nsnam/ns-3-dev/-/issues/579>. The TCP Westwood+ model is now named **TcpWestwoodPlus** and can be instantiated like all the other TCP flavors.
+* (internet) `TcpCubic` attribute `HyStartDetect` changed from `int` to `enum HybridSSDetectionMode`.
 
 ### Changes to build system
 
diff --git a/src/internet/model/tcp-cubic.cc b/src/internet/model/tcp-cubic.cc
index 3555effd3..ac01aebbc 100644
--- a/src/internet/model/tcp-cubic.cc
+++ b/src/internet/model/tcp-cubic.cc
@@ -62,10 +62,15 @@ TcpCubic::GetTypeId()
                           MakeUintegerChecker<uint32_t>())
             .AddAttribute("HyStartDetect",
                           "Hybrid Slow Start detection mechanisms:"
-                          "1: packet train, 2: delay, 3: both",
-                          IntegerValue(3),
-                          MakeIntegerAccessor(&TcpCubic::m_hystartDetect),
-                          MakeIntegerChecker<int>(1, 3))
+                          "packet train, delay, both",
+                          EnumValue(HybridSSDetectionMode::BOTH),
+                          MakeEnumAccessor(&TcpCubic::m_hystartDetect),
+                          MakeEnumChecker(HybridSSDetectionMode::PACKET_TRAIN,
+                                          "PACKET_TRAIN",
+                                          HybridSSDetectionMode::DELAY,
+                                          "DELAY",
+                                          HybridSSDetectionMode::BOTH,
+                                          "BOTH"))
             .AddAttribute("HyStartMinSamples",
                           "Number of delay samples for detecting the increase of delay",
                           UintegerValue(8),
diff --git a/src/internet/model/tcp-cubic.h b/src/internet/model/tcp-cubic.h
index d75974125..8802df62e 100644
--- a/src/internet/model/tcp-cubic.h
+++ b/src/internet/model/tcp-cubic.h
@@ -69,6 +69,16 @@ namespace ns3
 class TcpCubic : public TcpCongestionOps
 {
   public:
+    /**
+     * \brief Values to detect the Slow Start mode of HyStart
+     */
+    enum HybridSSDetectionMode
+    {
+        PACKET_TRAIN = 1, //!< Detection by trains of packet
+        DELAY = 2,        //!< Detection by delay value
+        BOTH = 3,         //!< Detection by both
+    };
+
     /**
      * \brief Get the type ID.
      * \return the object TypeId
@@ -93,24 +103,15 @@ class TcpCubic : public TcpCongestionOps
     Ptr<TcpCongestionOps> Fork() override;
 
   private:
-    /**
-     * \brief Values to detect the Slow Start mode of HyStart
-     */
-    enum HybridSSDetectionMode
-    {
-        PACKET_TRAIN = 0x1, //!< Detection by trains of packet
-        DELAY = 0x2         //!< Detection by delay value
-    };
-
     bool m_fastConvergence; //!< Enable or disable fast convergence algorithm
     double m_beta;          //!< Beta for cubic multiplicative increase
 
-    bool m_hystart;              //!< Enable or disable HyStart algorithm
-    int m_hystartDetect;         //!< Detect way for HyStart algorithm \see HybridSSDetectionMode
-    uint32_t m_hystartLowWindow; //!< Lower bound cWnd for hybrid slow start (segments)
-    Time m_hystartAckDelta;      //!< Spacing between ack's indicating train
-    Time m_hystartDelayMin;      //!< Minimum time for hystart algorithm
-    Time m_hystartDelayMax;      //!< Maximum time for hystart algorithm
+    bool m_hystart;                        //!< Enable or disable HyStart algorithm
+    HybridSSDetectionMode m_hystartDetect; //!< Detect way for HyStart algorithm
+    uint32_t m_hystartLowWindow;           //!< Lower bound cWnd for hybrid slow start (segments)
+    Time m_hystartAckDelta;                //!< Spacing between ack's indicating train
+    Time m_hystartDelayMin;                //!< Minimum time for hystart algorithm
+    Time m_hystartDelayMax;                //!< Maximum time for hystart algorithm
     uint8_t m_hystartMinSamples; //!< Number of delay samples for detecting the increase of delay
 
     uint32_t m_initialCwnd; //!< Initial cWnd