diff --git a/system/Makefile b/system/Makefile
index 0ed037c..932b60c 100644
--- a/system/Makefile
+++ b/system/Makefile
@@ -19,7 +19,7 @@ TOP_LEVEL_SOURCE=system.v
 SOURCES=processor.v memory.v registers.v alu.v decoder.v general.v biu.v execute.v
 EVENT_SIM_TESTBENCH=testbench.v
 VERILATOR_TESTBENCH=testbench.cpp
-INCLUDES=exec_state_def.v alu_header.v config.v ucode_header.v
+INCLUDES=exec_state_def.v alu_header.v config.v ucode_header.v error_header.v
 SYSTEM_VVP=system.vvp
 VERILATOR_BIN=obj_dir/Vsystem
 BOOT_CODE=boot_code.txt