diff --git a/src/ObjLoading/Parsing/StructuredDataDef/Domain/CommonStructuredDataDefEnum.cpp b/src/ObjLoading/Parsing/StructuredDataDef/Domain/CommonStructuredDataDefEnum.cpp
index af2e3ea9..4296f3fc 100644
--- a/src/ObjLoading/Parsing/StructuredDataDef/Domain/CommonStructuredDataDefEnum.cpp
+++ b/src/ObjLoading/Parsing/StructuredDataDef/Domain/CommonStructuredDataDefEnum.cpp
@@ -12,9 +12,18 @@ CommonStructuredDataDefEnumEntry::CommonStructuredDataDefEnumEntry(std::string n
 }
 
 CommonStructuredDataDefEnum::CommonStructuredDataDefEnum()
-= default;
-
-CommonStructuredDataDefEnum::CommonStructuredDataDefEnum(std::string name)
-    : m_name(std::move(name))
+    : m_reserved_entry_count(-1)
+{
+}
+
+CommonStructuredDataDefEnum::CommonStructuredDataDefEnum(std::string name)
+    : m_name(std::move(name)),
+      m_reserved_entry_count(-1)
+{
+}
+
+CommonStructuredDataDefEnum::CommonStructuredDataDefEnum(std::string name, const int reservedEntryCount)
+    : m_name(std::move(name)),
+      m_reserved_entry_count(reservedEntryCount)
 {
 }
diff --git a/src/ObjLoading/Parsing/StructuredDataDef/Domain/CommonStructuredDataDefEnum.h b/src/ObjLoading/Parsing/StructuredDataDef/Domain/CommonStructuredDataDefEnum.h
index 03788831..52e10731 100644
--- a/src/ObjLoading/Parsing/StructuredDataDef/Domain/CommonStructuredDataDefEnum.h
+++ b/src/ObjLoading/Parsing/StructuredDataDef/Domain/CommonStructuredDataDefEnum.h
@@ -14,8 +14,10 @@ struct CommonStructuredDataDefEnumEntry
 struct CommonStructuredDataDefEnum
 {
     std::string m_name;
+    int m_reserved_entry_count;
     std::vector<CommonStructuredDataDefEnumEntry> m_entries;
 
     CommonStructuredDataDefEnum();
     explicit CommonStructuredDataDefEnum(std::string name);
+    CommonStructuredDataDefEnum(std::string name, int reservedEntryCount);
 };
\ No newline at end of file
diff --git a/src/ObjLoading/Parsing/StructuredDataDef/Sequence/StructuredDataDefDefScopeSequences.cpp b/src/ObjLoading/Parsing/StructuredDataDef/Sequence/StructuredDataDefDefScopeSequences.cpp
index 10013315..a0a415a5 100644
--- a/src/ObjLoading/Parsing/StructuredDataDef/Sequence/StructuredDataDefDefScopeSequences.cpp
+++ b/src/ObjLoading/Parsing/StructuredDataDef/Sequence/StructuredDataDefDefScopeSequences.cpp
@@ -7,6 +7,7 @@ namespace sdd::def_scope_sequences
     class SequenceEnum final : public StructuredDataDefParser::sequence_t
     {
         static constexpr auto CAPTURE_NAME = 1;
+        static constexpr auto CAPTURE_RESERVED_COUNT = 2;
 
     public:
         SequenceEnum()
@@ -15,6 +16,11 @@ namespace sdd::def_scope_sequences
 
             AddMatchers({
                 create.Keyword("enum"),
+                create.Optional(create.And({
+                    create.Char('('),
+                    create.Integer().Capture(CAPTURE_RESERVED_COUNT),
+                    create.Char(')')
+                })),
                 create.Identifier().Capture(CAPTURE_NAME),
                 create.Char('{')
             });
@@ -26,6 +32,15 @@ namespace sdd::def_scope_sequences
             assert(state->m_current_def);
 
             auto newEnum = std::make_unique<CommonStructuredDataDefEnum>(result.NextCapture(CAPTURE_NAME).IdentifierValue());
+            if (result.HasNextCapture(CAPTURE_RESERVED_COUNT))
+            {
+                const auto& reservedCountToken = result.NextCapture(CAPTURE_RESERVED_COUNT);
+                newEnum->m_reserved_entry_count = reservedCountToken.IntegerValue();
+
+                if (newEnum->m_reserved_entry_count <= 0)
+                    throw ParsingException(reservedCountToken.GetPos(), "Reserved enum entry count must be greater than zero");
+            }
+
             state->m_current_enum = newEnum.get();
             state->m_def_types_by_name.emplace(newEnum->m_name, CommonStructuredDataDefType(CommonStructuredDataDefTypeCategory::ENUM, state->m_current_def->m_enums.size()));
             state->m_current_def->m_enums.emplace_back(std::move(newEnum));
diff --git a/src/ObjLoading/Parsing/StructuredDataDef/Sequence/StructuredDataDefEnumScopeSequences.cpp b/src/ObjLoading/Parsing/StructuredDataDef/Sequence/StructuredDataDefEnumScopeSequences.cpp
index bf0e242c..c14bcb12 100644
--- a/src/ObjLoading/Parsing/StructuredDataDef/Sequence/StructuredDataDefEnumScopeSequences.cpp
+++ b/src/ObjLoading/Parsing/StructuredDataDef/Sequence/StructuredDataDefEnumScopeSequences.cpp
@@ -29,7 +29,11 @@ namespace sdd::enum_scope_sequences
         {
             assert(state->m_current_enum);
 
-            state->m_current_enum->m_entries.emplace_back(result.NextCapture(CAPTURE_ENTRY_VALUE).StringValue(), state->m_current_enum->m_entries.size());
+            const auto& entryValueToken = result.NextCapture(CAPTURE_ENTRY_VALUE);
+            if (state->m_current_enum->m_reserved_entry_count > 0 && static_cast<size_t>(state->m_current_enum->m_reserved_entry_count) <= state->m_current_enum->m_entries.size())
+                throw ParsingException(entryValueToken.GetPos(), "Enum entry count exceeds reserved count");
+
+            state->m_current_enum->m_entries.emplace_back(entryValueToken.StringValue(), state->m_current_enum->m_entries.size());
         }
     };