diff --git a/cpu/cortexm_common/ldscripts/cortexm_base.ld b/cpu/cortexm_common/ldscripts/cortexm_base.ld
index e0cd989ff6..f97a9babde 100644
--- a/cpu/cortexm_common/ldscripts/cortexm_base.ld
+++ b/cpu/cortexm_common/ldscripts/cortexm_base.ld
@@ -144,7 +144,7 @@ SECTIONS
     _sheap = . ;
     _eheap = ORIGIN(ram) + LENGTH(ram);
 
-    /* Populate information abour ram size */
+    /* Populate information about ram size */
     _sram = ORIGIN(ram);
     _eram = ORIGIN(ram) + LENGTH(ram);
 }
diff --git a/cpu/cortexm_common/vectors_cortexm.c b/cpu/cortexm_common/vectors_cortexm.c
index 295cce4af9..56eaae22ab 100644
--- a/cpu/cortexm_common/vectors_cortexm.c
+++ b/cpu/cortexm_common/vectors_cortexm.c
@@ -49,8 +49,8 @@ extern uint32_t _szero;
 extern uint32_t _ezero;
 extern uint32_t _sstack;
 extern uint32_t _estack;
-extern uint32_t _sram;
-extern uint32_t _eram;
+extern uint8_t _sram;
+extern uint8_t _eram;
 /** @} */
 
 /**