diff --git a/src/test/testcpu.c b/src/test/testcpu.c
index 6f79c502..9691f9dd 100644
--- a/src/test/testcpu.c
+++ b/src/test/testcpu.c
@@ -1403,7 +1403,7 @@ TEST test_BPL(int8_t off, bool flag, uint16_t addrs) {
     PASS();
 }
 
-TEST test_BRA(int8_t off, bool flag, uint16_t addrs) {
+TEST test_BRA(volatile int8_t off, volatile bool flag, volatile uint16_t addrs) {
     HEADER0();
 
     cpu65_pc = addrs;