diff --git a/poky/meta/classes/reproducible_build.bbclass b/poky/meta/classes/reproducible_build.bbclass
index 278eeed..3781219 100644
--- a/poky/meta/classes/reproducible_build.bbclass
+++ b/poky/meta/classes/reproducible_build.bbclass
@@ -42,7 +42,7 @@
 SDE_DEPLOYDIR = "${WORKDIR}/deploy-source-date-epoch"
 
 # Enable compiler warning when the __TIME__, __DATE__ and __TIMESTAMP__ macros are used.
-TARGET_CC_ARCH_append_class-target = " -Wdate-time"
+TARGET_CC_ARCH:append:class-target = " -Wdate-time"
 
 # A SOURCE_DATE_EPOCH of '0' might be misinterpreted as no SDE
 export SOURCE_DATE_EPOCH_FALLBACK ??= "1302044400"