diff --git a/config/kernel-bio-empty-barrier.m4 b/config/kernel-bio-empty-barrier.m4
index 99549fe24..fda16b3ab 100644
--- a/config/kernel-bio-empty-barrier.m4
+++ b/config/kernel-bio-empty-barrier.m4
@@ -4,7 +4,6 @@ dnl # Empty write barriers are now supported and we should use them.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_BIO_EMPTY_BARRIER], [
 	AC_MSG_CHECKING([whether bio_empty_barrier() is defined])
-	EXTRA_KCFLAGS="-Werror"
 	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/bio.h>
 	],[
diff --git a/config/kernel-bio-end-io-t-args.m4 b/config/kernel-bio-end-io-t-args.m4
index ced486193..44e4826bf 100644
--- a/config/kernel-bio-end-io-t-args.m4
+++ b/config/kernel-bio-end-io-t-args.m4
@@ -9,8 +9,6 @@ dnl # to void.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_BIO_END_IO_T_ARGS], [
 	AC_MSG_CHECKING([whether bio_end_io_t wants 2 args])
-	tmp_flags="$EXTRA_KCFLAGS"
-	EXTRA_KCFLAGS="-Werror"
 	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/bio.h>
 	],[
@@ -25,5 +23,4 @@ AC_DEFUN([ZFS_AC_KERNEL_BIO_END_IO_T_ARGS], [
 	],[
 		AC_MSG_RESULT(no)
 	])
-	EXTRA_KCFLAGS="$tmp_flags"
 ])
diff --git a/config/kernel-security-inode-init.m4 b/config/kernel-security-inode-init.m4
index c21588af7..a62176d42 100644
--- a/config/kernel-security-inode-init.m4
+++ b/config/kernel-security-inode-init.m4
@@ -7,8 +7,6 @@ dnl # security checks will just be skipped.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY], [
 	AC_MSG_CHECKING([whether security_inode_init_security wants 6 args])
-	tmp_flags="$EXTRA_KCFLAGS"
-	EXTRA_KCFLAGS="-Werror"
 	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/security.h>
 	],[
@@ -27,7 +25,6 @@ AC_DEFUN([ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY], [
 	],[
 		AC_MSG_RESULT(no)
 	])
-	EXTRA_KCFLAGS="$tmp_flags"
 ])
 
 dnl #
@@ -39,8 +36,6 @@ dnl # and the EVM xattr.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY], [
 	AC_MSG_CHECKING([whether security_inode_init_security wants callback])
-	tmp_flags="$EXTRA_KCFLAGS"
-	EXTRA_KCFLAGS="-Werror"
 	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/security.h>
 	],[
@@ -57,5 +52,4 @@ AC_DEFUN([ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY], [
 	],[
 		AC_MSG_RESULT(no)
 	])
-	EXTRA_KCFLAGS="$tmp_flags"
 ])
diff --git a/config/kernel.m4 b/config/kernel.m4
index 6d28074d0..5623785fb 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -488,7 +488,7 @@ AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
 	modpost_flag=''
 	test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 	AS_IF(
-		[AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
+		[AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
 		[$4],
 		[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 	)