diff --git a/poky/meta/classes/toolchain-scripts.bbclass b/poky/meta/classes/toolchain-scripts.bbclass
index 67a812c..479f3b7 100644
--- a/poky/meta/classes/toolchain-scripts.bbclass
+++ b/poky/meta/classes/toolchain-scripts.bbclass
@@ -3,7 +3,7 @@
 # We want to be able to change the value of MULTIMACH_TARGET_SYS, because it
 # doesn't always match our expectations... but we default to the stock value
 REAL_MULTIMACH_TARGET_SYS ?= "${MULTIMACH_TARGET_SYS}"
-TARGET_CC_ARCH_append_libc-musl = " -mmusl"
+TARGET_CC_ARCH:append:libc-musl = " -mmusl"
 
 # default debug prefix map isn't valid in the SDK
 DEBUG_PREFIX_MAP = ""