diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index e6f3d94358..83281ce11b 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1379,6 +1379,10 @@ void cmGlobalGenerator::ComputeGeneratorTargetObjects()
     for(cmGeneratorTargetsType::iterator ti = targets.begin();
         ti != targets.end(); ++ti)
       {
+      if (ti->second->Target->IsImported())
+        {
+        continue;
+        }
       cmGeneratorTarget* gt = ti->second;
       gt->ClassifySources();
       gt->LookupObjectLibraries();
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index c3c529973c..0845120ebb 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -261,6 +261,10 @@ void cmLocalGenerator::TraceDependencies()
   for(cmGeneratorTargetsType::iterator t = targets.begin();
       t != targets.end(); ++t)
     {
+    if (t->second->Target->IsImported())
+      {
+      continue;
+      }
     t->second->TraceDependencies();
     }
 }
@@ -545,6 +549,10 @@ void cmLocalGenerator::GenerateTargetManifest()
       {
       continue;
       }
+    if (target.Target->IsImported())
+      {
+      continue;
+      }
     if(configNames.empty())
       {
       target.GenerateTargetManifest(0);