diff --git a/libs/pbd/system_exec.cc b/libs/pbd/system_exec.cc
index 87ca6c803a..02c52c5f3b 100644
--- a/libs/pbd/system_exec.cc
+++ b/libs/pbd/system_exec.cc
@@ -18,7 +18,6 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
-#include <poll.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -35,6 +34,7 @@
 #ifdef PLATFORM_WINDOWS
 #include <windows.h>
 #else
+#include <poll.h>
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/wait.h>