diff --git a/buildSrc/src/main/groovy/com/mindviewinc/plugins/TaggingPlugin.groovy b/buildSrc/src/main/groovy/com/mindviewinc/plugins/TaggingPlugin.groovy
index f0f0861b..e975ca06 100644
--- a/buildSrc/src/main/groovy/com/mindviewinc/plugins/TaggingPlugin.groovy
+++ b/buildSrc/src/main/groovy/com/mindviewinc/plugins/TaggingPlugin.groovy
@@ -25,7 +25,7 @@ class TaggingPlugin implements Plugin<Project> {
                 if(debug && tags.hasTags()) println tags
 
                 // Exclude java sources that will not compile
-                if (tags.willNotCompile) {
+                if (tags.willNotCompile || (tags.lowLevelAppendix && runningInAppveyor)) {
                     project.sourceSets.main.java.excludes.add(file.name)
                 } else {
                     JavaExec javaTask = null
diff --git a/buildSrc/src/main/groovy/com/mindviewinc/plugins/Tags.groovy b/buildSrc/src/main/groovy/com/mindviewinc/plugins/Tags.groovy
index 37398531..ed909a87 100644
--- a/buildSrc/src/main/groovy/com/mindviewinc/plugins/Tags.groovy
+++ b/buildSrc/src/main/groovy/com/mindviewinc/plugins/Tags.groovy
@@ -6,6 +6,7 @@ class Tags {
     Boolean excludeFromTravisCI = false
     Boolean excludeFromAppveyorCI = false
     Boolean excludeFromCI = false
+    Boolean lowLevelAppendix = false
     Boolean throwsException = false
     Boolean errorOutputExpected = false
     Boolean validateByHand = false
@@ -40,6 +41,7 @@ class Tags {
         excludeFromTravisCI = hasTag('ExcludeFromTravisCI')
         excludeFromAppveyorCI = hasTag('ExcludeFromAppveyorCI')
         excludeFromCI = hasTag('ExcludeFromCI')
+        lowLevelAppendix = firstLine.contains("// lowlevel/")
         throwsException = hasTag('ThrowsException')
         errorOutputExpected = hasTag('ErrorOutputExpected')
         validateByHand = hasTag('ValidateByHand')