diff --git a/cpu/cortexm_common/vectors_cortexm.c b/cpu/cortexm_common/vectors_cortexm.c
index 56eaae22ab..e0c9a784cc 100644
--- a/cpu/cortexm_common/vectors_cortexm.c
+++ b/cpu/cortexm_common/vectors_cortexm.c
@@ -375,7 +375,7 @@ __attribute__((weak,alias("dummy_handler_default"))) void isr_pendsv(void);
 __attribute__((weak,alias("dummy_handler_default"))) void isr_systick(void);
 
 /* define Cortex-M base interrupt vectors */
-ISR_VECTOR(0) cortexm_base_t cortex_vector_base = {
+ISR_VECTOR(0) const cortexm_base_t cortex_vector_base = {
     &_estack,
     {
         /* entry point of the program */