diff --git a/config-cm520-79f b/config-cm520-79f
index 96ff4dce..9622e061 100644
--- a/config-cm520-79f
+++ b/config-cm520-79f
@@ -1,6 +1,7 @@
 CONFIG_TARGET_ipq40xx=y
 CONFIG_TARGET_ipq40xx_generic=y
 CONFIG_TARGET_ipq40xx_generic_DEVICE_mobipromo_cm520-79f=y
+CONFIG_KERNEL_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_PACKAGE_ipq-wifi-mobipromo_cm520-79f=y
 CONFIG_DEFAULT_ath10k-firmware-qca4019-ct=y
 CONFIG_DEFAULT_kmod-ath10k-ct=y
diff --git a/config-p2w_r619ac b/config-p2w_r619ac
index d392a3b6..a4ddfed5 100644
--- a/config-p2w_r619ac
+++ b/config-p2w_r619ac
@@ -1,6 +1,7 @@
 CONFIG_TARGET_ipq40xx=y
 CONFIG_TARGET_ipq40xx_generic=y
 CONFIG_TARGET_ipq40xx_generic_DEVICE_p2w_r619ac-128m=y
+CONFIG_KERNEL_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_PACKAGE_ipq-wifi-p2w_r619ac=y
 CONFIG_DEFAULT_ath10k-firmware-qca4019-ct=y
 CONFIG_DEFAULT_kmod-ath10k-ct=y