diff --git a/lld/ELF/SyntheticSections.cpp b/lld/ELF/SyntheticSections.cpp
index efec41a737b62..16f1ab36a88b1 100644
--- a/lld/ELF/SyntheticSections.cpp
+++ b/lld/ELF/SyntheticSections.cpp
@@ -1647,6 +1647,8 @@ uint64_t DynamicReloc::getOffset() const {
 
 int64_t DynamicReloc::computeAddend(Ctx &ctx) const {
   switch (kind) {
+  case Computed:
+    llvm_unreachable("addend already computed");
   case AddendOnly:
     assert(sym == nullptr);
     return addend;
@@ -1748,7 +1750,7 @@ void DynamicReloc::computeRaw(Ctx &ctx, SymbolTableBaseSection *symt) {
   r_offset = getOffset();
   r_sym = getSymIndex(symt);
   addend = computeAddend(ctx);
-  kind = AddendOnly; // Catch errors
+  kind = Computed; // Catch errors
 }
 
 void RelocationBaseSection::computeRels() {
diff --git a/lld/ELF/SyntheticSections.h b/lld/ELF/SyntheticSections.h
index 5f01513630597..8e069e3dd9565 100644
--- a/lld/ELF/SyntheticSections.h
+++ b/lld/ELF/SyntheticSections.h
@@ -419,6 +419,9 @@ class StringTableSection final : public SyntheticSection {
 class DynamicReloc {
 public:
   enum Kind {
+    /// The resulting dynamic relocation has already had its addend computed.
+    /// Calling computeAddend() is an error. Only for internal use.
+    Computed,
     /// The resulting dynamic relocation does not reference a symbol (#sym must
     /// be nullptr) and uses #addend as the result of computeAddend(ctx).
     AddendOnly,
@@ -461,6 +464,7 @@ class DynamicReloc {
   uint64_t getOffset() const;
   uint32_t getSymIndex(SymbolTableBaseSection *symTab) const;
   bool needsDynSymIndex() const {
+    assert(kind != Computed && "cannot check kind after computeRaw");
     return kind == AgainstSymbol || kind == AgainstSymbolWithTargetVA;
   }