1 files changed, 3 insertions, 1 deletions
diff --git a/src/afl-fuzz.c b/src/afl-fuzz.c
index 9ca88b5b..78d9da71 100644
--- a/src/afl-fuzz.c
+++ b/src/afl-fuzz.c
@@ -212,7 +212,7 @@ static void usage(u8 *argv0, int more_help) {
       "  -e ext        - file extension for the fuzz test input file (if "
       "needed)\n"
       "  -u            - interval to update fuzzer_stats file in seconds, "
-      "defaults to 60 sec\n"
+      "defaults to 60 sec, minimum interval: 1 sec\n"
       "\n",
       argv0, EXEC_TIMEOUT, MEM_LIMIT, MAX_FILE, FOREIGN_SYNCS_MAX);
 
@@ -673,6 +673,8 @@ int main(int argc, char **argv_orig, char **envp) {
 
         }
 
+        if (stats_update_freq_sec < 1) { FATAL("-u interval must be >= 1"); }
+
         afl->stats_file_update_freq_msecs = stats_update_freq_sec * 1000;
         break;