diff --git a/src/fsharp/CompileOps.fs b/src/fsharp/CompileOps.fs
index d1c92bc636..082924e3b3 100755
--- a/src/fsharp/CompileOps.fs
+++ b/src/fsharp/CompileOps.fs
@@ -4260,7 +4260,7 @@ type TcImports(tcConfigP:TcConfigProvider, initialResolutions:TcAssemblyResoluti
 
         if tcImports.IsAlreadyRegistered ilShortAssemName then 
             let dllinfo = tcImports.FindDllInfo(m,ilShortAssemName)
-            let phase2() = [tcImports.FindCcuInfo(m,ilShortAssemName,lookupOnly=false)]
+            let phase2() = [tcImports.FindCcuInfo(m,ilShortAssemName,lookupOnly=true)] 
             dllinfo,phase2
         else 
             let dllinfo = {RawMetadata=assemblyData