diff --git a/aclocal/acx_pthread.m4 b/aclocal/acx_pthread.m4
index d318ab01..cbc9519c 100644
--- a/aclocal/acx_pthread.m4
+++ b/aclocal/acx_pthread.m4
@@ -39,7 +39,7 @@ fi
 # C compiler flags, and other items are library names, except for "none"
 # which indicates that we try without any flags at all.
 
-acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt"
+acx_pthread_flags="pthreads none -Kthread -kthread lthread pthread -pthread -pthreads -mthreads --thread-safe -mt"
 
 # The ordering *is* (sometimes) important.  Some notes on the
 # individual items follow: