diff --git a/lib/apm.js b/lib/apm.js
index ad912e2588..4d41314070 100644
--- a/lib/apm.js
+++ b/lib/apm.js
@@ -181,7 +181,7 @@ var Instrumentation = function(core, options, callback) {
       };
 
       // Filter out any sensitive commands
-      if(senstiveCommands.indexOf(commandName.toLowerCase())) {
+      if(senstiveCommands.indexOf(commandName.toLowerCase()) != -1) {
         command.commandObj = {};
         command.commandObj[commandName] = true;
       }
@@ -208,7 +208,7 @@ var Instrumentation = function(core, options, callback) {
           command.failure = err || r.result.writeErrors || r.result;
 
           // Filter out any sensitive commands
-          if(senstiveCommands.indexOf(commandName.toLowerCase())) {
+          if(senstiveCommands.indexOf(commandName.toLowerCase()) != -1) {
             command.failure = {};
           }