diff --git a/cpu/cc2430/stack.h b/cpu/cc2430/stack.h
index 18caccd9c..6ee7442b6 100644
--- a/cpu/cc2430/stack.h
+++ b/cpu/cc2430/stack.h
@@ -52,7 +52,6 @@ extern CC_AT_DATA uint8_t sp;
 
 #define stack_max_sp_print(f) do { \
   putstring(f); \
-  sp = SP; \
   puthex(stack_get_max()); \
   putchar('\n'); \
 } while(0)
diff --git a/cpu/cc253x/stack.h b/cpu/cc253x/stack.h
index 989875da4..16ceb92fa 100644
--- a/cpu/cc253x/stack.h
+++ b/cpu/cc253x/stack.h
@@ -52,7 +52,6 @@ extern CC_AT_DATA uint8_t sp;
 
 #define stack_max_sp_print(f) do { \
   putstring(f); \
-  sp = SP; \
   puthex(stack_get_max()); \
   putchar('\n'); \
 } while(0)