diff --git a/base-hw/src/platform/arm/crt0.s b/base-hw/src/platform/arm/crt0.s
index 94c54d922..093f9b0d6 100644
--- a/base-hw/src/platform/arm/crt0.s
+++ b/base-hw/src/platform/arm/crt0.s
@@ -33,6 +33,9 @@
 	.global __dso_handle
 	__dso_handle: .long 0
 
+	.global __initial_sp
+	__initial_sp: .long 0
+
 .section .bss
 
 	/* main-thread stack */