diff --git a/src/mos6502.exec.c b/src/mos6502.exec.c
index 306e74a..fe20253 100644
--- a/src/mos6502.exec.c
+++ b/src/mos6502.exec.c
@@ -14,9 +14,9 @@
  */
 DEFINE_INST(brk)
 {
-    cpu->P |= INTERRUPT;
     mos6502_push_stack(cpu, cpu->PC);
     mos6502_push_stack(cpu, cpu->P);
+    cpu->P |= INTERRUPT;
     cpu->PC += 2;
 }
 
diff --git a/tests/mos6502.exec.c b/tests/mos6502.exec.c
index 25e6631..7732ca2 100644
--- a/tests/mos6502.exec.c
+++ b/tests/mos6502.exec.c
@@ -8,10 +8,14 @@ TestSuite(mos6502_exec, .init = setup, .fini = teardown);
 
 Test(mos6502_exec, brk)
 {
+    vm_8bit orig_P = cpu->P;
+
     cpu->PC = 123;
     mos6502_handle_brk(cpu, 0);
     cr_assert_eq(cpu->PC, 125);
     cr_assert_eq(cpu->P & INTERRUPT, INTERRUPT);
+
+    cr_assert_eq(mos6502_pop_stack(cpu), orig_P);
     cr_assert_eq(mos6502_pop_stack(cpu), 123);
 }