diff --git a/CASA/gui/Makefile.am b/CASA/gui/Makefile.am
index 2189c8da..474fa0e7 100644
--- a/CASA/gui/Makefile.am
+++ b/CASA/gui/Makefile.am
@@ -71,7 +71,6 @@ CSFILES =$(srcdir)/AssemblyInfo.cs \
 	$(srcdir)/StoreDataInterface.cs \
 	$(srcdir)/StorePolicyInterface.cs \
 	$(srcdir)/CommonGUI.cs \
-	$(srcdir)/SingleApplication.cs \ 
 	$(srcdir)/Common.cs 
 
 CSFILES_CSC := $(subst /,$(SEP),$(CSFILES))