@@ -5,6 +5,7 @@
 import graphql.Internal;
 import graphql.normalized.ExecutableNormalizedField;
 
+import java.io.File;
 import java.nio.file.FileSystems;
 import java.nio.file.Path;
 import java.nio.file.PathMatcher;
@@ -30,6 +31,7 @@
 public class DataFetchingFieldSelectionSetImpl implements DataFetchingFieldSelectionSet {
 
     private final static String SEP = "/";
+    private final static boolean UNIXY = SEP.equals(File.separator);
 
     private final static DataFetchingFieldSelectionSet NOOP = new DataFetchingFieldSelectionSet() {
 
@@ -110,6 +112,7 @@ public boolean contains(String fieldGlobPattern) {
         fieldGlobPattern = removeLeadingSlash(fieldGlobPattern);
         PathMatcher globMatcher = globMatcher(fieldGlobPattern);
         for (String flattenedField : flattenedFieldsForGlobSearching) {
+            flattenedField = osAppropriate(flattenedField);
             Path path = Paths.get(flattenedField);
             if (globMatcher.matches(path)) {
                 return true;
@@ -118,6 +121,14 @@ public boolean contains(String fieldGlobPattern) {
         return false;
     }
 
+    private String osAppropriate(String flattenedField) {
+        if (UNIXY) {
+            return flattenedField;
+        } else {
+            return flattenedField.replace(SEP, "\\");
+        }
+    }
+
     @Override
     public boolean containsAnyOf(String fieldGlobPattern, String... fieldGlobPatterns) {
         assertNotNull(fieldGlobPattern);