diff --git a/arch/xtensa/src/esp32/esp32_start.c b/arch/xtensa/src/esp32/esp32_start.c
index 8cca41fa32..8bfbf733e1 100644
--- a/arch/xtensa/src/esp32/esp32_start.c
+++ b/arch/xtensa/src/esp32/esp32_start.c
@@ -51,7 +51,7 @@
 /* Address of the CPU0 IDLE thread */
 
 uint32_t g_idlestack[IDLETHREAD_STACKWORDS]
-  __attribute__((aligned(16) section(".noinit")));
+  __attribute__((aligned(16), section(".noinit")));
 
 /****************************************************************************
  * Public Functions