diff --git a/src/util/virthread.c b/src/util/virthread.c
index 40792afdc069081ae12b700d76479916d7b38427..37b2cdfbe92a07c964d10b18bfbbd21ffe529896 100644
--- a/src/util/virthread.c
+++ b/src/util/virthread.c
@@ -23,6 +23,10 @@
 
 #include "virthread.h"
 
+#ifdef __FreeBSD__
+# include <pthread_np.h>
+#endif
+
 #include <unistd.h>
 #include <inttypes.h>
 #if HAVE_SYS_SYSCALL_H