diff --git a/meta/recipes-rt/rt-tests/rt-tests.inc b/meta/recipes-rt/rt-tests/rt-tests.inc
index 1d876b0684..954782c6bb 100644
--- a/meta/recipes-rt/rt-tests/rt-tests.inc
+++ b/meta/recipes-rt/rt-tests/rt-tests.inc
@@ -8,7 +8,7 @@ SRC_URI = "git://git.kernel.org/pub/scm/linux/kernel/git/clrkwllms/rt-tests.git
 S = "${WORKDIR}/git"
 
 # need to append rt-tests' default CFLAGS to ours
-CFLAGS += "-I${S}/src/include -D_GNU_SOURCE -Wall -Wno-nonnulli"
+CFLAGS += "-I${S}/src/include -D_GNU_SOURCE -Wall -Wno-nonnull"
 
 # calling 'uname -m' is broken on crossbuilds
 EXTRA_OEMAKE = "NUMA=0"