diff --git a/SConstruct b/SConstruct
index 7168603eb..4f9aa9983 100644
--- a/SConstruct
+++ b/SConstruct
@@ -819,7 +819,7 @@ class DXXProgram(DXXCommon):
 'editor/eglobal.cpp',
 'editor/elight.cpp',
 'editor/eobject.cpp',
-'editor/eswitch.c',
+'editor/eswitch.cpp',
 'editor/fixseg.c',
 'editor/group.c',
 'editor/info.c',
diff --git a/similar/editor/eswitch.c b/similar/editor/eswitch.cpp
similarity index 99%
rename from similar/editor/eswitch.c
rename to similar/editor/eswitch.cpp
index 662ea2f40..6d5c8e240 100644
--- a/similar/editor/eswitch.c
+++ b/similar/editor/eswitch.cpp
@@ -25,6 +25,7 @@ COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
 #include "inferno.h"
 #include "editor.h"
 #include "editor/esegment.h"
+#include "editor/kdefs.h"
 #include "eswitch.h"
 #include "segment.h"
 #include "dxxerror.h"