diff --git a/libgloss/aarch64/crt0.S b/libgloss/aarch64/crt0.S
index 0c669d9ba..cc7e84ddf 100644
--- a/libgloss/aarch64/crt0.S
+++ b/libgloss/aarch64/crt0.S
@@ -243,7 +243,7 @@ FUNCTION (_cpu_init_hook):
 	ret
 
 	.align 3
-#ifdef ARM_RDP_MONITOR
+#ifdef ARM_RDI_MONITOR
 .LC0:
 	GEN_DWORD HeapBase
 #else