diff --git a/src/main/java/eu/ha3/presencefootsteps/util/Range.java b/src/main/java/eu/ha3/presencefootsteps/util/Range.java
index c7d3f922..37edfc8d 100644
--- a/src/main/java/eu/ha3/presencefootsteps/util/Range.java
+++ b/src/main/java/eu/ha3/presencefootsteps/util/Range.java
@@ -16,7 +16,7 @@ public static Range exactly(float value) {
     }
 
     public Range read(String name, JsonObject json) {
-        if ("volume".equals(name) && json.has("vol") || json.has("vol_min") || json.has("vol_max")) {
+        if ("volume".equals(name) && (json.has("vol") || json.has("vol_min") || json.has("vol_max"))) {
             return read("vol", json);
         }
         if (json.has(name)) {