diff --git a/configure.ac b/configure.ac
index 5b44e357..7868cfb8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -175,6 +175,8 @@ if test x$xthreads = xyes ; then
     freebsd*)
         XTHREAD_CFLAGS="-D_THREAD_SAFE"
         XTHREADLIB="-pthread" ;;
+    dragonfly*)
+        XTHREADLIB="-pthread" ;;
     solaris*)
 	XTHREAD_CFLAGS="-D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS" ;;
     esac