diff --git a/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerPeripheral.java b/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerPeripheral.java
index 669b532b0..e3e98fbe4 100644
--- a/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerPeripheral.java
+++ b/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerPeripheral.java
@@ -150,7 +150,7 @@ public class SpeakerPeripheral implements IPeripheral {
 
         if (arguments.length > 1)
         {
-            if (!(arguments[1] instanceof Double) && !(arguments[1] == null))   // Arg wrong type
+            if (!(arguments[1] instanceof Double) && arguments[1] != null)   // Arg wrong type
             {
                 throw new LuaException("Expected string, number (optional), number (optional)");
             }
@@ -160,7 +160,7 @@ public class SpeakerPeripheral implements IPeripheral {
 
         if (arguments.length > 2)
         {
-            if (!(arguments[1] instanceof Double) && !(arguments[2] == null))  // Arg wrong type
+            if (!(arguments[1] instanceof Double) && arguments[2] != null)  // Arg wrong type
             {
                 throw new LuaException("Expected string, number (optional), number (optional)");
             }
@@ -200,7 +200,7 @@ public class SpeakerPeripheral implements IPeripheral {
 
         if (arguments.length > 1)
         {
-            if (!(arguments[1] instanceof Double) && !(arguments[1] == null))  // Arg wrong type
+            if (!(arguments[1] instanceof Double) && arguments[1] != null)  // Arg wrong type
             {
                 throw new LuaException("Expected string, number (optional), number (optional)");
             }
@@ -211,7 +211,7 @@ public class SpeakerPeripheral implements IPeripheral {
 
         if (arguments.length > 2)
         {
-            if (!(arguments[2] instanceof Double) && !(arguments[2] == null))  // Arg wrong type
+            if (!(arguments[2] instanceof Double) && arguments[2] != null)  // Arg wrong type
             {
                 throw new LuaException("Expected string, number (optional), number (optional)");
             }