diff --git a/lib/fko_util.c b/lib/fko_util.c
index bd36d87f..c39bdbdb 100644
--- a/lib/fko_util.c
+++ b/lib/fko_util.c
@@ -428,7 +428,7 @@ strtol_wrapper(const char * const str, const int min,
         if(exit_upon_err == EXIT_UPON_ERR)
         {
             perror("strtol");
-            fprintf(stderr, "[*] Value %d out of range %d - %d\n",
+            fprintf(stderr, "[*] Value %d out of range [(%d)-(%d)]\n",
                 val, min, max);
             exit(EXIT_FAILURE);
         }
@@ -439,7 +439,7 @@ strtol_wrapper(const char * const str, const int min,
         *err = FKO_ERROR_INVALID_DATA_UTIL_STRTOL_LT_MIN;
         if(exit_upon_err == EXIT_UPON_ERR)
         {
-            fprintf(stderr, "[*] Value %d out of range %d - %d\n",
+            fprintf(stderr, "[*] Value %d out of range [(%d)-(%d)]\n",
                 val, min, max);
             exit(EXIT_FAILURE);
         }
@@ -453,7 +453,7 @@ strtol_wrapper(const char * const str, const int min,
         *err = FKO_ERROR_INVALID_DATA_UTIL_STRTOL_GT_MAX;
         if(exit_upon_err == EXIT_UPON_ERR)
         {
-            fprintf(stderr, "[*] Value %d out of range %d - %d\n",
+            fprintf(stderr, "[*] Value %d out of range [(%d)-(%d)]\n",
                 val, min, max);
             exit(EXIT_FAILURE);
         }