diff --git a/src/basic/fd-util.c b/src/basic/fd-util.c
index b968bf948c..bea9a93ff5 100644
--- a/src/basic/fd-util.c
+++ b/src/basic/fd-util.c
@@ -935,3 +935,16 @@ int dir_fd_is_root(int dir_fd) {
          */
         return statx_inode_same(&st.sx, &pst.sx) && statx_mount_same(&st.nsx, &pst.nsx);
 }
+
+const char *accmode_to_string(int flags) {
+        switch (flags & O_ACCMODE) {
+        case O_RDONLY:
+                return "ro";
+        case O_WRONLY:
+                return "wo";
+        case O_RDWR:
+                return "rw";
+        default:
+                return NULL;
+        }
+}
diff --git a/src/basic/fd-util.h b/src/basic/fd-util.h
index a6353cf48e..91f3d7fe9d 100644
--- a/src/basic/fd-util.h
+++ b/src/basic/fd-util.h
@@ -115,3 +115,5 @@ static inline char *format_proc_fd_path(char buf[static PROC_FD_PATH_MAX], int f
 
 #define FORMAT_PROC_FD_PATH(fd) \
         format_proc_fd_path((char[PROC_FD_PATH_MAX]) {}, (fd))
+
+const char *accmode_to_string(int flags);