diff --git a/src/log.c b/src/log.c
index 86f47b9a..7bd2e74e 100644
--- a/src/log.c
+++ b/src/log.c
@@ -129,7 +129,7 @@ void open_logbuffer(void) {
             return;
         }
 
-#if defined(__APPLE__)
+#if defined(__OpenBSD__) || defined(__APPLE__)
         if (ftruncate(logbuffer_shm, logbuffer_size) == -1) {
             fprintf(stderr, "Could not ftruncate SHM segment for the i3 log: %s\n", strerror(errno));
 #else