diff --git a/src/override/memcpy.cc b/src/override/memcpy.cc
index 6d1ebce..b854e16 100644
--- a/src/override/memcpy.cc
+++ b/src/override/memcpy.cc
@@ -10,7 +10,8 @@
 using namespace snmalloc;
 
 // glibc lacks snprintf_l
-#ifdef __linux__
+#if defined(__linux__) || defined(__OpenBSD__) || defined(__DragonFly__) || \
+  defined(__HAIKU__)
 #  define snprintf_l(buf, size, loc, msg, ...) \
     snprintf(buf, size, msg, __VA_ARGS__)
 // Windows has it with an underscore prefix