diff --git a/boards/px4/fmu-v5/nuttx-config/debug/defconfig b/boards/px4/fmu-v5/nuttx-config/debug/defconfig
index 00d49c593c2..8223096ac14 100644
--- a/boards/px4/fmu-v5/nuttx-config/debug/defconfig
+++ b/boards/px4/fmu-v5/nuttx-config/debug/defconfig
@@ -123,7 +123,7 @@ CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_I2C=y
 CONFIG_I2C_RESET=y
-CONFIG_IDLETHREAD_STACKSIZE=800
+CONFIG_IDLETHREAD_STACKSIZE=864
 CONFIG_LIBC_FLOATINGPOINT=y
 CONFIG_LIBC_LONG_LONG=y
 CONFIG_LIBC_STRERROR=y