diff --git a/security/sandbox/chromium/sandbox/linux/seccomp-bpf/trap.cc b/security/sandbox/chromium/sandbox/linux/seccomp-bpf/trap.cc
index 003708d2c..79488795d 100644
--- a/security/sandbox/chromium/sandbox/linux/seccomp-bpf/trap.cc
+++ b/security/sandbox/chromium/sandbox/linux/seccomp-bpf/trap.cc
@@ -25,6 +25,11 @@
 #include "sandbox/linux/system_headers/linux_seccomp.h"
 #include "sandbox/linux/system_headers/linux_signal.h"
 
+// musl libc defines siginfo_t __si_fields instead of _sifields
+#if defined(OS_LINUX) && !defined(__GLIBC__)
+#define _sifields __si_fields
+#endif
+
 namespace {
 
 struct arch_sigsys {
diff --git a/security/sandbox/linux/SandboxFilter.cpp b/security/sandbox/linux/SandboxFilter.cpp
index 0f59f2a87..5c07dbb31 100644
--- a/security/sandbox/linux/SandboxFilter.cpp
+++ b/security/sandbox/linux/SandboxFilter.cpp
@@ -989,6 +989,7 @@ class ContentSandboxPolicy : public SandboxPolicyCommon {
             // ffmpeg, and anything else that calls isatty(), will be told
             // that nothing is a typewriter:
             .ElseIf(request == TCGETS, Error(ENOTTY))
+            .ElseIf(request == TIOCGWINSZ, Error(ENOTTY))
             // Allow anything that isn't a tty ioctl, for now; bug 1302711
             // will cover changing this to a default-deny policy.
             .ElseIf(shifted_type != kTtyIoctls, Allow())