Index: lld/COFF/Config.h
===================================================================
--- lld/COFF/Config.h
+++ lld/COFF/Config.h
@@ -84,7 +84,7 @@
   std::string OutputFile;
   std::string ImportName;
   bool DoGC = true;
-  bool DoICF = true;
+  bool DoICF = false;
   bool Relocatable = true;
   bool Force = false;
   bool Debug = false;
Index: lld/test/COFF/icf-associative.test
===================================================================
--- lld/test/COFF/icf-associative.test
+++ lld/test/COFF/icf-associative.test
@@ -1,5 +1,5 @@
 # RUN: yaml2obj < %s > %t.obj
-# RUN: lld-link /entry:foo /out:%t.exe /subsystem:console /include:bar \
+# RUN: lld-link /opt:icf /entry:foo /out:%t.exe /subsystem:console /include:bar \
 # RUN:   /debug /verbose %t.obj > %t.log 2>&1
 # RUN: FileCheck %s < %t.log
 
Index: lld/test/COFF/icf-circular.test
===================================================================
--- lld/test/COFF/icf-circular.test
+++ lld/test/COFF/icf-circular.test
@@ -1,5 +1,5 @@
 # RUN: yaml2obj < %s > %t.obj
-# RUN: lld-link /entry:foo /out:%t.exe /subsystem:console /include:bar \
+# RUN: lld-link /opt:icf /entry:foo /out:%t.exe /subsystem:console /include:bar \
 # RUN:   /verbose %t.obj > %t.log 2>&1
 # RUN: FileCheck %s < %t.log
 
Index: lld/test/COFF/icf-circular2.test
===================================================================
--- lld/test/COFF/icf-circular2.test
+++ lld/test/COFF/icf-circular2.test
@@ -1,5 +1,5 @@
 # RUN: yaml2obj < %s > %t.obj
-# RUN: lld-link /entry:foo /out:%t.exe /subsystem:console /include:bar \
+# RUN: lld-link /opt:icf /entry:foo /out:%t.exe /subsystem:console /include:bar \
 # RUN:   /verbose %t.obj > %t.log 2>&1
 # RUN: FileCheck %s < %t.log
 
Index: lld/test/COFF/icf-simple.test
===================================================================
--- lld/test/COFF/icf-simple.test
+++ lld/test/COFF/icf-simple.test
@@ -1,5 +1,5 @@
 # RUN: yaml2obj < %s > %t.obj
-# RUN: lld-link /entry:foo /out:%t.exe /subsystem:console /include:bar \
+# RUN: lld-link /opt:icf /entry:foo /out:%t.exe /subsystem:console /include:bar \
 # RUN:   /verbose %t.obj > %t.log 2>&1
 # RUN: FileCheck -check-prefix=ICF %s < %t.log