diff --git a/SConstruct b/SConstruct
index bf5f95ed0..0d042c4e0 100644
--- a/SConstruct
+++ b/SConstruct
@@ -803,7 +803,7 @@ class DXXProgram(DXXCommon):
 'main/vclip.c',
 'main/wall.c',
 'main/weapon.c',
-'mem/mem.c',
+'mem/mem.cpp',
 'misc/args.c',
 'misc/hash.c',
 'misc/physfsx.c',
diff --git a/similar/mem/mem.c b/similar/mem/mem.cpp
similarity index 100%
rename from similar/mem/mem.c
rename to similar/mem/mem.cpp