diff --git a/src/USER-MISC/fix_imd.cpp b/src/USER-MISC/fix_imd.cpp
index 10aaa285a5..362ae213c8 100644
--- a/src/USER-MISC/fix_imd.cpp
+++ b/src/USER-MISC/fix_imd.cpp
@@ -1237,7 +1237,7 @@ void *imdsock_accept(void * v) {
 #elif defined(SOCKLEN_T)
   SOCKLEN_T len;
 #define _SOCKLEN_TYPE SOCKLEN_T
-#elif defined(_POSIX_SOURCE) || (defined(__APPLE__) && defined(__MACH__)) || defined(__linux)
+#elif defined(_POSIX_SOURCE) || (defined(__APPLE__) && defined(__MACH__)) || defined(__linux) || defined(__FreeBSD__)
   socklen_t len;
 #define _SOCKLEN_TYPE socklen_t
 #else