diff --git a/src/or/config.c b/src/or/config.c
index 70d87034a8..2ba9c76729 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -2649,6 +2649,37 @@ options_validate(or_options_t *old_options, or_options_t *options,
         RECOMMENDED_MIN_CIRCUIT_BUILD_TIMEOUT );
   }
 
+  if (options->PathBiasNoticeRate > 1.0) {
+    tor_asprintf(msg,
+              "PathBiasNoticeRate is too high. "
+              "It must be between 0 and 1.0");
+    return -1;
+  }
+  if (options->PathBiasWarnRate > 1.0) {
+    tor_asprintf(msg,
+              "PathBiasWarnRate is too high. "
+              "It must be between 0 and 1.0");
+    return -1;
+  }
+  if (options->PathBiasExtremeRate > 1.0) {
+    tor_asprintf(msg,
+              "PathBiasExtremeRate is too high. "
+              "It must be between 0 and 1.0");
+    return -1;
+  }
+  if (options->PathBiasNoticeUseRate > 1.0) {
+    tor_asprintf(msg,
+              "PathBiasNoticeUseRate is too high. "
+              "It must be between 0 and 1.0");
+    return -1;
+  }
+  if (options->PathBiasExtremeUseRate > 1.0) {
+    tor_asprintf(msg,
+              "PathBiasExtremeUseRate is too high. "
+              "It must be between 0 and 1.0");
+    return -1;
+  }
+
   if (options->MaxCircuitDirtiness < MIN_MAX_CIRCUIT_DIRTINESS) {
     log_warn(LD_CONFIG, "MaxCircuitDirtiness option is too short; "
              "raising to %d seconds.", MIN_MAX_CIRCUIT_DIRTINESS);