diff --git a/idea-plugin/src/main/java/com/palantir/javaformat/intellij/PalantirJavaFormatFormattingService.java b/idea-plugin/src/main/java/com/palantir/javaformat/intellij/PalantirJavaFormatFormattingService.java
index e28a716b..ec4ccef7 100644
--- a/idea-plugin/src/main/java/com/palantir/javaformat/intellij/PalantirJavaFormatFormattingService.java
+++ b/idea-plugin/src/main/java/com/palantir/javaformat/intellij/PalantirJavaFormatFormattingService.java
@@ -88,11 +88,21 @@ public void run() {
                 return;
             }
 
+            String preFormatText = request.getDocumentText();
+
             try {
                 String formattedText = applyReplacements(
                         request.getDocumentText(),
                         formatterService.get().getFormatReplacements(request.getDocumentText(), toRanges(request)));
-                request.onTextReady(formattedText);
+
+                // The Javadoc of this API says that you should set it to null when the document is unchanged
+                // We should not be trying to format a document that is already formatted
+                if (preFormatText.equals(formattedText)) {
+                    request.onTextReady(null);
+                } else {
+                    request.onTextReady(formattedText);
+                }
+
             } catch (FormatterException e) {
                 request.onError(
                         Notifications.PARSING_ERROR_TITLE,