diff --git a/sources.cmake b/sources.cmake
index 388a7bc..823b9b9 100644
--- a/sources.cmake
+++ b/sources.cmake
@@ -2,6 +2,7 @@ set(erc_sources
 	apple2.c
 	apple2.dd.c
 	apple2.draw.c
+	apple2.mem.c
 	log.c
 	mos6502.c
 	mos6502.addr.c