diff --git a/lld/wasm/Relocations.cpp b/lld/wasm/Relocations.cpp
--- a/lld/wasm/Relocations.cpp
+++ b/lld/wasm/Relocations.cpp
@@ -34,15 +34,11 @@
 static bool allowUndefined(const Symbol* sym) {
   // Undefined functions and globals with explicit import name are allowed to be
   // undefined at link time.
-  if (auto *f = dyn_cast<UndefinedFunction>(sym))
-    if (f->importName || config->importUndefined)
-      return true;
-  if (auto *g = dyn_cast<UndefinedGlobal>(sym))
-    if (g->importName)
-      return true;
-  if (auto *g = dyn_cast<UndefinedGlobal>(sym))
-    if (g->importName)
-      return true;
+  if (sym->importName)
+    return true;
+  if (isa<UndefinedFunction>(sym) || config->importUndefined)
+    return true;
+
   return config->allowUndefinedSymbols.count(sym->getName()) != 0;
 }