diff --git a/config.d/pthread.m4 b/config.d/pthread.m4
index ec60e91d2..1e70c3a11 100644
--- a/config.d/pthread.m4
+++ b/config.d/pthread.m4
@@ -3,6 +3,16 @@ if test "x$ac_cv_header_pthread_h" = "xyes"; then
 	case "$host_os" in
 		*qnx*)  dnl qnx have all pthread* functions in the libc.
 			;;
+		*openbsd*)
+			LIBS="$LIBS -pthread"
+			AC_TRY_LINK(
+				[#include <pthread.h>],
+				[pthread_attr_t type;
+				 pthread_attr_setstacksize(&type, 0x100000);],
+				[PTHREAD_LDFLAGS=-pthread],
+				[PTHREAD_LDFLAGS=-lpthread]
+			)
+			;;
 		*)  LIBS="$LIBS -lpthread"
 			AC_TRY_LINK(
 				[#include <pthread.h>],