diff --git a/include/exec/poison.h b/include/exec/poison.h
index 1a7a57baae..b862320fa6 100644
--- a/include/exec/poison.h
+++ b/include/exec/poison.h
@@ -44,6 +44,7 @@
 #pragma GCC poison TARGET_LONG_BITS
 #pragma GCC poison TARGET_FMT_lx
 #pragma GCC poison TARGET_FMT_ld
+#pragma GCC poison TARGET_FMT_lu
 
 #pragma GCC poison TARGET_PAGE_SIZE
 #pragma GCC poison TARGET_PAGE_MASK