diff --git a/SConstruct b/SConstruct
index 1c19835be..8bfd3a8ab 100644
--- a/SConstruct
+++ b/SConstruct
@@ -803,7 +803,7 @@ class DXXProgram(DXXCommon):
 'main/text.cpp',
 'main/titles.cpp',
 'main/vclip.cpp',
-'main/wall.c',
+'main/wall.cpp',
 'main/weapon.c',
 'mem/mem.cpp',
 'misc/args.cpp',
diff --git a/similar/main/wall.c b/similar/main/wall.cpp
similarity index 100%
rename from similar/main/wall.c
rename to similar/main/wall.cpp