diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
index 1eea594f549..8279b05a6ef 100644
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -4,7 +4,7 @@
 # Warning flags for compiling the kernel and components of the kernel:
 #
 CWARNFLAGS?=	-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
-		-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
+		-Wmissing-prototypes -Wpointer-arith -Wcast-qual \
 		-Wundef -Wno-pointer-sign ${FORMAT_EXTENSIONS} \
 		-Wmissing-include-dirs -fdiagnostics-show-option \
 		-Wno-unknown-pragmas \