diff --git a/src/jyut-dict/components/entryheaderwidget.cpp b/src/jyut-dict/components/entryheaderwidget.cpp
index 614941ba..f7951260 100644
--- a/src/jyut-dict/components/entryheaderwidget.cpp
+++ b/src/jyut-dict/components/entryheaderwidget.cpp
@@ -9,7 +9,7 @@ EntryHeaderWidget::EntryHeaderWidget(QWidget *parent) : QWidget(parent)
     _wordLabel->setTextInteractionFlags(Qt::TextSelectableByMouse);
     _wordLabel->setWordWrap(true);
     _wordLabel->setStyleSheet("QLabel { font-size: 24px}");
-#if __WIN32
+#ifdef __WIN32
     _wordLabel->setFont(QFont("MingLiU"));
 #endif
 
diff --git a/src/jyut-dict/components/mainsplitter.cpp b/src/jyut-dict/components/mainsplitter.cpp
index 933a9aa9..984ef33a 100644
--- a/src/jyut-dict/components/mainsplitter.cpp
+++ b/src/jyut-dict/components/mainsplitter.cpp
@@ -26,7 +26,7 @@ MainSplitter::MainSplitter(QWidget *parent) : QSplitter(parent)
                    { \
                           background-color: rgb(0, 0, 0); \
                    }");
-#elif __WIN32__
+#elif __WIN32
     setStyleSheet("QSplitter::handle \
                    { \
                           background-color: #b9b9b9; \
diff --git a/src/jyut-dict/components/maintoolbar.cpp b/src/jyut-dict/components/maintoolbar.cpp
index e974ff0f..a7751287 100644
--- a/src/jyut-dict/components/maintoolbar.cpp
+++ b/src/jyut-dict/components/maintoolbar.cpp
@@ -23,7 +23,7 @@ MainToolBar::MainToolBar(QWidget *parent) : QToolBar(parent)
     setMovable(false);
     setFloatable(false);
 
-#if __WIN32
+#ifdef __WIN32
     setStyleSheet("QToolBar { background-color: white; }");
 #endif
 }
diff --git a/src/jyut-dict/components/searchlistview.cpp b/src/jyut-dict/components/searchlistview.cpp
index ba1ae9e7..33042885 100644
--- a/src/jyut-dict/components/searchlistview.cpp
+++ b/src/jyut-dict/components/searchlistview.cpp
@@ -21,7 +21,7 @@ SearchListView::SearchListView(QWidget *parent)
     setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
 }
 
-#if __WIN32
+#ifdef __WIN32
 void SearchListView::wheelEvent(QWheelEvent *event)
 {
     int singleStep = verticalScrollBar()->singleStep();
diff --git a/src/jyut-dict/components/searchlistview.h b/src/jyut-dict/components/searchlistview.h
index e32594e1..70b45ab1 100644
--- a/src/jyut-dict/components/searchlistview.h
+++ b/src/jyut-dict/components/searchlistview.h
@@ -18,7 +18,7 @@ class SearchListView : public QListView
 public:
     explicit SearchListView(QWidget *parent = nullptr);
 
-#if __WIN32
+#ifdef __WIN32
     void wheelEvent(QWheelEvent *event) override;
 #endif