diff --git a/opcontrol/opcontrol.cpp b/opcontrol/opcontrol.cpp
index f8031a6..3eb0d28 100644
--- a/opcontrol/opcontrol.cpp
+++ b/opcontrol/opcontrol.cpp
@@ -326,11 +326,11 @@
         close(fd);
     }
 
-    if (mkdir(OP_DATA_DIR, 755)) {
+    if (mkdir(OP_DATA_DIR, 0755)) {
         fprintf(stderr, "Cannot create directory \"%s\": %s\n",
                 OP_DATA_DIR, strerror(errno));
     }
-    if (mkdir(OP_DATA_DIR"/samples", 644)) {
+    if (mkdir(OP_DATA_DIR"/samples", 0755)) {
         fprintf(stderr, "Cannot create directory \"%s\": %s\n",
                 OP_DATA_DIR"/samples", strerror(errno));
     }
@@ -342,7 +342,7 @@
 
     setup_session_dir();
 
-    if (mkdir(OP_DRIVER_BASE, 644)) {
+    if (mkdir(OP_DRIVER_BASE, 0755)) {
         fprintf(stderr, "Cannot create directory "OP_DRIVER_BASE": %s\n",
                 strerror(errno));
         return -1;