diff --git a/src/cpu/Makefile.am b/src/cpu/Makefile.am
index 261369fb..62cc988d 100644
--- a/src/cpu/Makefile.am
+++ b/src/cpu/Makefile.am
@@ -3,5 +3,5 @@ AM_CPPFLAGS = -I$(top_srcdir)/include
 
 noinst_LIBRARIES = libcpu.a
 libcpu_a_SOURCES = callback.cpp cpu.cpp flags.cpp modrm.cpp modrm.h core_full.cpp instructions.h	\
-		   paging.cpp lazyflags.h core_normal.cpp \
+		   paging.cpp lazyflags.h core_normal.cpp core_simple.cpp \
 		   core_dyn_x86.cpp
\ No newline at end of file