Index: llvm/lib/Linker/IRMover.cpp
===================================================================
--- llvm/lib/Linker/IRMover.cpp
+++ llvm/lib/Linker/IRMover.cpp
@@ -1342,7 +1342,7 @@
 
 IRMover::IRMover(Module &M) : Composite(M) {
   TypeFinder StructTypes;
-  StructTypes.run(M, true);
+  StructTypes.run(M, /* OnlyNamed */ false);
   for (StructType *Ty : StructTypes) {
     if (Ty->isOpaque())
       IdentifiedStructTypes.addOpaque(Ty);
Index: llvm/test/ThinLTO/X86/Inputs/import_opaque_type.ll
===================================================================
--- /dev/null
+++ llvm/test/ThinLTO/X86/Inputs/import_opaque_type.ll
@@ -0,0 +1,15 @@
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.11.0"
+
+%0 = type { i8 }
+
+%a = type { %0 * }
+
+define void @bar(%a *) {
+	ret void
+}
+
+define void @baz() {
+	call void @bar(%a *null)
+	ret void
+}
Index: llvm/test/ThinLTO/X86/import_opaque_type.ll
===================================================================
--- /dev/null
+++ llvm/test/ThinLTO/X86/import_opaque_type.ll
@@ -0,0 +1,27 @@
+; Do setup work for all below tests: generate bitcode and combined index
+; RUN: opt -module-summary %s -o %t.bc
+; RUN: opt -module-summary %p/Inputs/import_opaque_type.ll -o %t2.bc
+; RUN: llvm-lto -thinlto-action=thinlink -o %t3.bc %t.bc %t2.bc
+
+; Check that we import correctly the imported type to replace the opaque one here
+; RUN: llvm-lto -thinlto-action=import %t.bc -thinlto-index=%t3.bc -o - | llvm-dis -o - | FileCheck %s
+
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.11.0"
+
+; CHECK: %0 = type { i8 }
+%0 = type opaque
+
+%a = type { %0 * }
+
+declare void @baz()
+define void @foo(%a *) {
+	call void @baz()
+	ret void
+}
+
+define i32 @main() {
+    call void @foo(%a *null)
+	ret i32 0
+}