diff --git a/config/fuchsia/BUILD.gn b/config/fuchsia/BUILD.gn
index 9a0ca692f..56d79f417 100644
--- a/config/fuchsia/BUILD.gn
+++ b/config/fuchsia/BUILD.gn
@@ -51,7 +51,11 @@ config("compiler") {
 
   # TODO(crbug.com/821951): Clang enables SafeStack by default when targeting
   # Fuchsia, but it breaks some tests, notably in V8.
-  cflags += [ "-fno-sanitize=safe-stack" ]
+  # Force the toolchain to use shadow-call-stack instead, until that is default.
+  cflags += [
+    "-fno-sanitize=safe-stack",
+    "-fsanitize=shadow-call-stack",
+  ]
 
   libs = [ "zircon" ]
 }