diff --git a/pmd-apex/src/main/resources/category/apex/bestpractices.xml b/pmd-apex/src/main/resources/category/apex/bestpractices.xml
index 56ce704297..dc0f1bfb4e 100644
--- a/pmd-apex/src/main/resources/category/apex/bestpractices.xml
+++ b/pmd-apex/src/main/resources/category/apex/bestpractices.xml
@@ -187,7 +187,8 @@ Having the Logging Level specified provides a cleaner log, and improves readabil
           <property name="xpath">
              <value>
 <![CDATA[
-//MethodCallExpression[@FullMethodName='System.debug'][count(*)=2]
+//MethodCallExpression[lower-case(@FullMethodName)='system.debug'][count(*)=2
+    or ($strictMode=true() and count(*)=3 and lower-case(VariableExpression/@Image)='debug')]
 ]]>
              </value>
           </property>
diff --git a/pmd-apex/src/test/resources/net/sourceforge/pmd/lang/apex/rule/bestpractices/xml/DebugsShouldUseLoggingLevel.xml b/pmd-apex/src/test/resources/net/sourceforge/pmd/lang/apex/rule/bestpractices/xml/DebugsShouldUseLoggingLevel.xml
index 6cfe38bfc9..431c9c2e47 100644
--- a/pmd-apex/src/test/resources/net/sourceforge/pmd/lang/apex/rule/bestpractices/xml/DebugsShouldUseLoggingLevel.xml
+++ b/pmd-apex/src/test/resources/net/sourceforge/pmd/lang/apex/rule/bestpractices/xml/DebugsShouldUseLoggingLevel.xml
@@ -46,6 +46,33 @@ public class Foo {
     static void methodATest() {
         System.debug(LoggingLevel.DEBUG, 'I am a good debug.') // good
     }
+}
+        ]]></code>
+    </test-code>
+
+    <test-code>
+        <description>Any other method of System is allowed - avoiding false positives</description>
+        <expected-problems>0</expected-problems>
+        <code><![CDATA[
+public class Foo {
+    public void bar() {
+        System.otherMethod();
+        System.otherMethod('test');
+    }
+}
+        ]]></code>
+    </test-code>
+
+    <test-code>
+        <description>Test case insensitivity</description>
+        <rule-property name="strictMode">true</rule-property>
+        <expected-problems>2</expected-problems>
+        <code><![CDATA[
+public class Foo {
+    public void bar() {
+        SyStEm.DeBuG('test');
+        SyStEm.DeBuG(LoGiNgLeVeL.dEbUg, 'test');
+    }
 }
         ]]></code>
     </test-code>