diff --git a/libs/js/nsprpub/configure b/libs/js/nsprpub/configure
index e56f702124..bc91bc3d74 100755
--- a/libs/js/nsprpub/configure
+++ b/libs/js/nsprpub/configure
@@ -3449,6 +3449,7 @@ EOF
 *-freebsd*)
     if test -z "$USE_NSPR_THREADS"; then
         USE_PTHREADS=1
+        LDFLAGS="$LDFLAGS -lpthread"
     fi
     cat >> confdefs.h <<\EOF
 #define XP_UNIX 1