diff --git a/Changes b/Changes
index 2b3e63fac..a2b96cf76 100644
--- a/Changes
+++ b/Changes
@@ -19,6 +19,7 @@ Verilator 5.017 devel
 * Support resizing function call inout arguments (#4467).
 * Support converting parameters inside modules to localparams (#4511). [Anthony Donlon]
 * Fix conversion of impure logical expressions to bit expressions (#487 partial) (#4437). [Ryszard Rozak, Antmicro Ltd.]
+* Fix enum functions in localparams (#3999). [Andrew Nolte]
 * Fix passing arguments by reference (#3385 partial) (#4489). [Ryszard Rozak, Antmicro Ltd.]
 * Fix multithreading handling to separate by code units that use/never use it (#4228). [Mariusz Glebocki, Antmicro Ltd.]
 * Fix usage of annotation options (#4486) (#4504). [Michal Czyz]
diff --git a/src/V3AstNodeDType.h b/src/V3AstNodeDType.h
index b8ee2c72e..e1353b9a1 100644
--- a/src/V3AstNodeDType.h
+++ b/src/V3AstNodeDType.h
@@ -754,10 +754,14 @@ class AstEnumDType final : public AstNodeDType {
     // Parents: TYPEDEF/MODULE
     // @astgen op1 := childDTypep : Optional[AstNodeDType]
     // @astgen op2 := itemsp : List[AstEnumItem]
+public:
+    using TableMap = std::map<VAttrType, AstVar*>;
+
 private:
     string m_name;  // Name from upper typedef, if any
     AstNodeDType* m_refDTypep = nullptr;  // Elements are of this type after V3Width
     const int m_uniqueNum = 0;
+    TableMap m_tableMap;  // Created table for V3Width only to remove duplicates
 
 public:
     AstEnumDType(FileLine* fl, VFlagChildDType, AstNodeDType* dtp, AstEnumItem* itemsp)
@@ -770,9 +774,12 @@ public:
         widthFromSub(subDTypep());
     }
     ASTGEN_MEMBERS_AstEnumDType;
+
     const char* broken() const override {
         BROKEN_RTN(!((m_refDTypep && !childDTypep() && m_refDTypep->brokeExists())
                      || (!m_refDTypep && childDTypep())));
+        BROKEN_RTN(std::any_of(m_tableMap.begin(), m_tableMap.end(),
+                               [](const auto& p) { return !p.second->brokeExists(); }));
         return nullptr;
     }
     void cloneRelink() override {
@@ -809,6 +816,8 @@ public:
         return count;
     }
     bool isCompound() const override { return false; }
+    TableMap& tableMap() { return m_tableMap; }
+    const TableMap& tableMap() const { return m_tableMap; }
 };
 class AstIfaceRefDType final : public AstNodeDType {
     // Reference to an interface, either for a port, or inside parent cell
diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index 1d6468001..7f7e8214f 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -7193,8 +7193,9 @@ private:
     }
     AstVar* enumVarp(AstEnumDType* nodep, VAttrType attrType, bool assoc, uint32_t msbdim) {
         // Return a variable table which has specified dimension properties for this variable
-        const auto pos = m_tableMap.find(std::make_pair(nodep, attrType));
-        if (pos != m_tableMap.end()) return pos->second;
+        const auto& tableMapr = nodep->tableMap();
+        const auto pos = tableMapr.find(attrType);
+        if (pos != tableMapr.end()) return pos->second;
         UINFO(9, "Construct Venumtab attr=" << attrType.ascii() << " assoc=" << assoc
                                             << " max=" << msbdim << " for " << nodep << endl);
         AstNodeDType* basep;
@@ -7276,7 +7277,7 @@ private:
             }
         }
         userIterate(varp, nullptr);  // May have already done $unit so must do this var
-        m_tableMap.emplace(std::make_pair(nodep, attrType), varp);
+        nodep->tableMap().emplace(attrType, varp);
         return varp;
     }
 
diff --git a/src/V3WidthCommit.h b/src/V3WidthCommit.h
index 959bde51b..ec538084c 100644
--- a/src/V3WidthCommit.h
+++ b/src/V3WidthCommit.h
@@ -184,13 +184,18 @@ private:
         nodep->replaceWith(nodep->lhsp()->unlinkFrBack());
         VL_DO_DANGLING(pushDeletep(nodep), nodep);
     }
-    void visit(AstNodeDType* nodep) override {  //
+    void visit(AstNodeDType* nodep) override {
+        // Note some specific dtypes have unique visitors
         visitIterateNodeDType(nodep);
     }
     void visit(AstNodeUOrStructDType* nodep) override {
         if (nodep->user1SetOnce()) return;  // Process once
         visitIterateNodeDType(nodep);
     }
+    void visit(AstEnumDType* nodep) override {
+        nodep->tableMap().clear();  // Only needed up through V3Width process
+        visitIterateNodeDType(nodep);
+    }
     void visit(AstParamTypeDType* nodep) override {
         if (nodep->user1SetOnce()) return;  // Process once
         visitIterateNodeDType(nodep);
diff --git a/test_regress/t/t_enum_const_methods.v b/test_regress/t/t_enum_const_methods.v
index e5ce9e979..547a19a02 100644
--- a/test_regress/t/t_enum_const_methods.v
+++ b/test_regress/t/t_enum_const_methods.v
@@ -36,11 +36,20 @@ module t ();
 
    localparam string e0_name = get_name(E0);
 
+   function automatic enm_t get_2();
+      enm_t enm;
+      enm = E0;
+      return enm.next.next;
+   endfunction
+
+   localparam enm_t enum_2 = get_2();
+
    initial begin
       if (enum_first != E0) $stop;
       if (enum_last != E2) $stop;
       if (enum_second != E1) $stop;
       if (e0_name != "E0") $stop;
+      if (enum_2 != E2) $stop;
       $write("*-* All Finished *-*\n");
       $finish;
    end