diff --git a/pd/src/s_audio_pa.c b/pd/src/s_audio_pa.c
index d87770a1154526edb1a2aff1ee393ebeaef8558c..e15c0eafded441fc75e167259594cab574df3f00 100644
--- a/pd/src/s_audio_pa.c
+++ b/pd/src/s_audio_pa.c
@@ -26,6 +26,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <fcntl.h>
 #include <portaudio.h>
 
 #ifdef _MSC_VER