diff --git a/CMakeLists.txt b/CMakeLists.txt
index 599c7a79f..f4c914101 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -376,6 +376,7 @@ if(OPENBSD)
 	set(WITH_ALSA  "OFF")
 	set(WITH_PULSE "ON")
 	set(WITH_WAYLAND "OFF")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DHAVE_PTHREAD_GNU_EXT")
 endif()
 
 # Android
diff --git a/winpr/libwinpr/synch/wait.c b/winpr/libwinpr/synch/wait.c
index 18c1d05ff..5fa5e834c 100644
--- a/winpr/libwinpr/synch/wait.c
+++ b/winpr/libwinpr/synch/wait.c
@@ -109,7 +109,7 @@ static long long ts_difftime(const struct timespec *o,
 #if !defined(HAVE_PTHREAD_GNU_EXT)
 #include <pthread.h>
 
-#if defined(__FreeBSD__) || defined(sun) || defined(__OpenBSD__)
+#if defined(__FreeBSD__) || defined(sun)
 /*the only way to get it work is to remove the static*/
 int pthread_mutex_timedlock(pthread_mutex_t *mutex, const struct timespec *timeout)
 #else