diff --git a/src/Makefile.d/detect.mk b/src/Makefile.d/detect.mk
index 89c193a32bfc6ee0faa32f979271b810b556f0f9..3edf0dad4b6b86eec70dfa0d6e9c4be1ca7bf8e0 100644
--- a/src/Makefile.d/detect.mk
+++ b/src/Makefile.d/detect.mk
@@ -94,7 +94,7 @@ ifeq (,$(filter $(v),$(gcc_versions)))
 define line =
 Your compiler version, GCC $(version), \
 is not supported by the Makefile.
-The Makefile will assume GCC $(latest_gcc_version).))
+The Makefile will assume GCC $(latest_gcc_version).
 endef
 $(call Print,$(line))
 GCC$(subst .,,$(latest_gcc_version)):=1