diff --git a/src/libpsl-native/src/getuserfrompid.cpp b/src/libpsl-native/src/getuserfrompid.cpp
index 63478a2..5b55680 100644
--- a/src/libpsl-native/src/getuserfrompid.cpp
+++ b/src/libpsl-native/src/getuserfrompid.cpp
@@ -11,7 +11,7 @@
 #include <sstream>
 #include <errno.h>
 
-#if __APPLE__
+#if __APPLE__ || __FreeBSD__
 #include <sys/sysctl.h>
 #elif HAVE_SYSCONF
 // do nothing