diff --git a/toolchain/toolchain-external/Config.in b/toolchain/toolchain-external/Config.in
index 8c948716c..c74388f12 100644
--- a/toolchain/toolchain-external/Config.in
+++ b/toolchain/toolchain-external/Config.in
@@ -994,7 +994,7 @@ choice
 
 config BR2_TOOLCHAIN_EXTERNAL_HEADERS_3_17
 	bool "3.17.x"
-	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3.17
+	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 
 config BR2_TOOLCHAIN_EXTERNAL_HEADERS_3_16
 	bool "3.16.x"