Index: lib/sanitizer_common/sanitizer_common_interceptors.inc
===================================================================
--- lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -7664,6 +7664,19 @@
 #define INIT_SYSCTLGETMIBINFO
 #endif
 
+#if SANITIZER_INTERCEPT_NL_LANGINFO
+INTERCEPTOR(char *, nl_langinfo, long item) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, nl_langinfo, item);
+  char *ret = REAL(nl_langinfo)(item);
+  if (ret)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, REAL(strlen)(ret) + 1);
+  return ret;
+}
+#define INIT_NL_LANGINFO COMMON_INTERCEPT_FUNCTION(nl_langinfo)
+#else
+#define INIT_NL_LANGINFO
+#endif
 
 static void InitializeCommonInterceptors() {
   static u64 metadata_mem[sizeof(MetadataHashMap) / sizeof(u64) + 1];
@@ -7927,6 +7940,7 @@
   INIT_SYSCTL;
   INIT_ASYSCTL;
   INIT_SYSCTLGETMIBINFO;
+  INIT_NL_LANGINFO;
 
   INIT___PRINTF_CHK;
 }
Index: lib/sanitizer_common/sanitizer_platform_interceptors.h
===================================================================
--- lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -520,6 +520,7 @@
   SI_LINUX || SI_MAC)
 #define SANITIZER_INTERCEPT_GETMNTINFO SI_NETBSD
 #define SANITIZER_INTERCEPT_MI_VECTOR_HASH SI_NETBSD
+#define SANITIZER_INTERCEPT_NL_LANGINFO SI_NETBSD
 #define SANITIZER_INTERCEPT_GETVFSSTAT SI_NETBSD
 #define SANITIZER_INTERCEPT_REGEX SI_NETBSD
 #define SANITIZER_INTERCEPT_FTS SI_NETBSD
Index: test/sanitizer_common/TestCases/NetBSD/nl_langinfo.cc
===================================================================
--- test/sanitizer_common/TestCases/NetBSD/nl_langinfo.cc
+++ test/sanitizer_common/TestCases/NetBSD/nl_langinfo.cc
@@ -0,0 +1,18 @@
+// RUN: %clangxx -O0 -g %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#include <langinfo.h>
+
+#include <stdio.h>
+
+int main(void) {
+  printf("nl_langinfo\n");
+
+  char *info = nl_langinfo(DAY_1);
+
+  printf("DAY_1='%s'\n", info);
+
+  // CHECK: nl_langinfo
+  // CHECK: DAY_1='{{.*}}'
+
+  return 0;
+}