diff --git a/test/test_interrupt.c b/test/test_interrupt.c
index 464a833..eb93b10 100644
--- a/test/test_interrupt.c
+++ b/test/test_interrupt.c
@@ -5,6 +5,7 @@
 #include <stdbool.h>
 #include <string.h>
 
+#include "assembler.h"
 #include "bus.h"
 #include "rk65c02.h"
 #include "instruction.h"