diff --git a/lib/IRGen/GenDecl.cpp b/lib/IRGen/GenDecl.cpp
index 13514b9..fd06a97 100644
--- a/lib/IRGen/GenDecl.cpp
+++ b/lib/IRGen/GenDecl.cpp
@@ -1416,7 +1416,8 @@
 
   case SILLinkage::Shared:
   case SILLinkage::SharedExternal:
-    return RESULT(LinkOnceODR, Hidden, Default);
+    return isDefinition ? RESULT(LinkOnceODR, Hidden, Default)
+                        : RESULT(External, Hidden, Default);
 
   case SILLinkage::Hidden:
     return RESULT(External, Hidden, Default);
diff --git a/test/IRGen/Inputs/usr/include/NSOption.h b/test/IRGen/Inputs/usr/include/NSOption.h
new file mode 100644
index 0000000..aec8045
--- /dev/null
+++ b/test/IRGen/Inputs/usr/include/NSOption.h
@@ -0,0 +1,7 @@
+#define CF_OPTIONS(_type, _name) enum _name : _type _name; enum _name : _type
+#define NS_OPTIONS(_type, _name) CF_OPTIONS(_type, _name)
+
+typedef NS_OPTIONS(int, SomeOptions) {
+  SomeOptionsFoo = 1,
+  SomeOptionsBar = 2,
+};
diff --git a/test/IRGen/objc_shared_imported_decl.sil b/test/IRGen/objc_shared_imported_decl.sil
new file mode 100644
index 0000000..eab941f
--- /dev/null
+++ b/test/IRGen/objc_shared_imported_decl.sil
@@ -0,0 +1,16 @@
+// RUN: %target-swift-frontend -primary-file %s -import-objc-header %S/Inputs/usr/include/NSOption.h -emit-ir | %FileCheck %s
+
+// REQUIRES: objc_interop
+
+import Swift
+
+sil public @use_witness : $@convention(thin) () -> () {
+  %0 = witness_method $SomeOptions, #Equatable."=="!1 : <Self where Self : Equatable> (Self.Type) -> (Self, Self) -> Bool : $@convention(witness_method) <τ_0_0 where τ_0_0 : Equatable> (@in τ_0_0, @in τ_0_0, @thick τ_0_0.Type) -> Bool
+  %1 = tuple ()
+  return %1: $()
+}
+
+// We used to emit linkonce_odr llvm linkage for this declaration.
+sil_witness_table shared SomeOptions : Equatable module __ObjC
+
+// CHECK: @_T0SC11SomeOptionsVs9EquatableSoWP = external hidden global