diff --git a/cli/loader.h b/cli/loader.h
index 76358e527d88f..cbe6431a7b580 100755
--- a/cli/loader.h
+++ b/cli/loader.h
@@ -25,6 +25,7 @@
 #include <mach-o/dyld.h>
 #endif
 #ifdef _OS_FREEBSD_
+#include <stddef.h>
 #include <sys/sysctl.h>
 #endif
 #include <stdio.h>
@@ -58,4 +59,4 @@ LPWSTR *CommandLineToArgv(LPWSTR lpCmdLine, int *pNumArgs);
 int wchar_to_utf8(const wchar_t * wstr, char *str, size_t maxlen);
 int utf8_to_wchar(const char * str, wchar_t *wstr, size_t maxlen);
 void setup_stdio(void);
-#endif
\ No newline at end of file
+#endif