diff --git a/platform/diff-impl/src/com/intellij/diff/tools/util/base/DiffViewerBase.java b/platform/diff-impl/src/com/intellij/diff/tools/util/base/DiffViewerBase.java
index ecff176b3132..349abfd2334d 100644
--- a/platform/diff-impl/src/com/intellij/diff/tools/util/base/DiffViewerBase.java
+++ b/platform/diff-impl/src/com/intellij/diff/tools/util/base/DiffViewerBase.java
@@ -61,7 +61,7 @@ public abstract class DiffViewerBase implements DiffViewer, DataProvider {
   @NotNull
   @Override
   public final FrameDiffTool.ToolbarComponents init() {
-    if (LOG.isDebugEnabled() && getComponent().getWidth() <= 0 || getComponent().getHeight() <= 0) {
+    if (LOG.isDebugEnabled() && (getComponent().getWidth() <= 0 || getComponent().getHeight() <= 0)) {
       LOG.warn("Diff shown for a hidden component, initial scroll position might be invalid", new Throwable());
     }