diff --git a/toolchain/toolchain-external/toolchain-external-custom/Config.in.options b/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
index 7a27714e09..0a4003b57c 100644
--- a/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
+++ b/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
@@ -46,6 +46,10 @@ choice
 	  Set to the gcc version that is used by your external
 	  toolchain.
 
+config BR2_TOOLCHAIN_EXTERNAL_GCC_15
+	bool "15.x"
+	select BR2_TOOLCHAIN_GCC_AT_LEAST_15
+
 config BR2_TOOLCHAIN_EXTERNAL_GCC_14
 	bool "14.x"
 	select BR2_TOOLCHAIN_GCC_AT_LEAST_14