diff --git a/audio/sdlaudio.c b/audio/sdlaudio.c
index aa226f05a0..71d15d5a42 100644
--- a/audio/sdlaudio.c
+++ b/audio/sdlaudio.c
@@ -29,7 +29,7 @@
 #ifndef _WIN32
 #ifdef __sun__
 #define _POSIX_PTHREAD_SEMANTICS 1
-#elif defined(__OpenBSD__)
+#elif defined(__OpenBSD__) || defined(__FreeBSD__)
 #include <pthread.h>
 #endif
 #include <signal.h>