diff --git a/ports/avr/tests-main.c b/ports/avr/tests-main.c
index a634167..c8c9abb 100644
--- a/ports/avr/tests-main.c
+++ b/ports/avr/tests-main.c
@@ -186,7 +186,7 @@ int main ( void )
                      TEST_THREAD_PRIO, main_thread_func, 0,
                      &main_thread_stack[0],
                      MAIN_STACK_SIZE_BYTES,
-					 TRUE);
+                     TRUE);
         if (status == ATOM_OK)
         {
             /**
diff --git a/ports/stm8/tests-main.c b/ports/stm8/tests-main.c
index 6b24bf2..7981a19 100644
--- a/ports/stm8/tests-main.c
+++ b/ports/stm8/tests-main.c
@@ -150,7 +150,7 @@ NO_REG_SAVE void main ( void )
                      TEST_THREAD_PRIO, main_thread_func, 0,
                      &main_thread_stack[0],
                      MAIN_STACK_SIZE_BYTES,
-					 TRUE);
+                     TRUE);
         if (status == ATOM_OK)
         {
             /**