diff --git a/fb_arc_set/shared/shm.c b/fb_arc_set/shared/shm.c
index d581ec0..fe16f55 100644
--- a/fb_arc_set/shared/shm.c
+++ b/fb_arc_set/shared/shm.c
@@ -22,12 +22,14 @@ int create_shmfd(char *shm_name) {
     return shmfd;
 }
 
-void* open_shm(int shmfd, size_t shm_size) {
+void truncate_shm(int shmfd, size_t shm_size) {
     if(ftruncate(shmfd, shm_size) < 0) {
         fprintf(stderr, "ERROR: Failed truncating shared memory object\n");
         exit(EXIT_FAILURE);
     }
+}
 
+void* open_shm(int shmfd, size_t shm_size) {
     void* shm;
     shm = mmap(NULL, shm_size, PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);
 
diff --git a/fb_arc_set/supervisor.c b/fb_arc_set/supervisor.c
index 7a18201..20ec17c 100644
--- a/fb_arc_set/supervisor.c
+++ b/fb_arc_set/supervisor.c
@@ -33,6 +33,7 @@ int main(int argc, char *argv[]) {
 
     /// Open shared memory objects
     int buffer_shmfd = create_shmfd(BUFFER_SHM_NAME);
+    truncate_shm(buffer_shmfd, BUFF_SIZE);
     circ_buffer = (buffer_t *)open_shm(buffer_shmfd, sizeof(buffer_t));
 
     /// Open semaphores