diff --git a/sys/unix/hints/include/compiler.370 b/sys/unix/hints/include/compiler.370
index 5ef6f801e..b686636a2 100755
--- a/sys/unix/hints/include/compiler.370
+++ b/sys/unix/hints/include/compiler.370
@@ -98,6 +98,7 @@ CXX=clang++ -std=gnu++11
 # clang-specific follows
 CLANGGTEQ12 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 12)
 CLANGGTEQ14 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 14)
+CLANGGTEQ21 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 21)
 ifeq "$(CLANGGTEQ12)" "1"
 CFLAGS+=-Wimplicit-fallthrough
 endif
@@ -109,6 +110,9 @@ else
 # older versions complain about things newer ones don't without this
 CFLAGS+=-Wno-missing-field-initializers
 endif
+ifeq "$(CLANGGTEQ21)" "1"
+CFLAGS+=-Wno-deprecated-octal-literals
+endif
 # none
 endif  # clang-specific ends here