1 files changed, 1 insertions, 0 deletions
diff --git a/utils.h b/utils.h
index 1dc12ec8..9961ec70 100644
--- a/utils.h
+++ b/utils.h
@@ -270,6 +270,7 @@ const char *get_argv0_buf(void);
 	"-t|--tbytes        show sizes in TiB, or TB with --si"
 
 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode);
+int string_is_numerical(const char *str);
 
 static inline void warning(const char *fmt, ...)
 {