diff --git a/src/calibre/gui2/pictureflow/pictureflow.cpp b/src/calibre/gui2/pictureflow/pictureflow.cpp
index 66bb509c5d..32e91dc41a 100644
--- a/src/calibre/gui2/pictureflow/pictureflow.cpp
+++ b/src/calibre/gui2/pictureflow/pictureflow.cpp
@@ -1351,7 +1351,7 @@ void PictureFlow::keyPressEvent(QKeyEvent* event)
 #define SPEED_UPPER_LIMIT 40
 
 qreal PictureFlow::device_pixel_ratio() const {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
 	return devicePixelRatioF();
 #else
 	return (qreal)devicePixelRatio();
diff --git a/src/calibre/headless/fontconfig_database.cpp b/src/calibre/headless/fontconfig_database.cpp
index eacbe8ee3f..34620fc514 100644
--- a/src/calibre/headless/fontconfig_database.cpp
+++ b/src/calibre/headless/fontconfig_database.cpp
@@ -269,7 +269,7 @@ static const char *specialLanguages[] = {
     "sa", // Siddham
     "sd", // Khudawadi
     "mai", // Tirhuta
-#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
     "hoc", // WarangCiti
     "", // Ahom
     "", // AnatolianHieroglyphs