diff --git a/src/Compilers/CSharp/csc/csc.rsp b/src/Compilers/CSharp/csc/csc.rsp
index 5c2b62a281b04..ce72ac60cf253 100644
--- a/src/Compilers/CSharp/csc/csc.rsp
+++ b/src/Compilers/CSharp/csc/csc.rsp
@@ -38,7 +38,7 @@
 /r:System.Web.Mobile.dll
 /r:System.Web.RegularExpressions.dll
 /r:System.Web.Services.dll
-/r:System.Windows.Forms.Dll
+/r:System.Windows.Forms.dll
 /r:System.Workflow.Activities.dll
 /r:System.Workflow.ComponentModel.dll
 /r:System.Workflow.Runtime.dll
diff --git a/src/Compilers/VisualBasic/vbc/vbc.rsp b/src/Compilers/VisualBasic/vbc/vbc.rsp
index 064f771ccc28b..8350880b91e58 100644
--- a/src/Compilers/VisualBasic/vbc/vbc.rsp
+++ b/src/Compilers/VisualBasic/vbc/vbc.rsp
@@ -29,7 +29,7 @@
 /r:System.Web.Mobile.dll
 /r:System.Web.RegularExpressions.dll
 /r:System.Web.Services.dll
-/r:System.Windows.Forms.Dll
+/r:System.Windows.Forms.dll
 /r:System.XML.dll
 
 /r:System.Workflow.Activities.dll