diff --git a/UI/display-helpers.hpp b/UI/display-helpers.hpp
index 5b1b20ca7..eff3c51ea 100644
--- a/UI/display-helpers.hpp
+++ b/UI/display-helpers.hpp
@@ -17,10 +17,6 @@
 
 #pragma once
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
-#define SUPPORTS_FRACTIONAL_SCALING
-#endif
-
 static inline void GetScaleAndCenterPos(int baseCX, int baseCY, int windowCX,
 					int windowCY, int &x, int &y,
 					float &scale)
@@ -55,9 +51,5 @@ static inline void GetCenterPosFromFixedScale(int baseCX, int baseCY,
 
 static inline QSize GetPixelSize(QWidget *widget)
 {
-#ifdef SUPPORTS_FRACTIONAL_SCALING
 	return widget->size() * widget->devicePixelRatioF();
-#else
-	return widget->size() * widget->devicePixelRatio();
-#endif
 }
diff --git a/UI/window-basic-interaction.cpp b/UI/window-basic-interaction.cpp
index 304fb56c5..b2788259b 100644
--- a/UI/window-basic-interaction.cpp
+++ b/UI/window-basic-interaction.cpp
@@ -221,11 +221,7 @@ static int TranslateQtMouseEventModifiers(QMouseEvent *event)
 bool OBSBasicInteraction::GetSourceRelativeXY(int mouseX, int mouseY, int &relX,
 					      int &relY)
 {
-#ifdef SUPPORTS_FRACTIONAL_SCALING
 	float pixelRatio = devicePixelRatioF();
-#else
-	float pixelRatio = devicePixelRatio();
-#endif
 	int mouseXscaled = (int)roundf(mouseX * pixelRatio);
 	int mouseYscaled = (int)roundf(mouseY * pixelRatio);
 
diff --git a/UI/window-basic-main.cpp b/UI/window-basic-main.cpp
index f27bc85af..20b18e373 100644
--- a/UI/window-basic-main.cpp
+++ b/UI/window-basic-main.cpp
@@ -1279,13 +1279,8 @@ bool OBSBasic::InitBasicConfigDefaults()
 	uint32_t cx = primaryScreen->size().width();
 	uint32_t cy = primaryScreen->size().height();
 
-#ifdef SUPPORTS_FRACTIONAL_SCALING
 	cx *= devicePixelRatioF();
 	cy *= devicePixelRatioF();
-#elif
-	cx *= devicePixelRatio();
-	cy *= devicePixelRatio();
-#endif
 
 	bool oldResolutionDefaults = config_get_bool(
 		App()->GlobalConfig(), "General", "Pre19Defaults");
diff --git a/UI/window-basic-preview.cpp b/UI/window-basic-preview.cpp
index 579b34dbb..fa211e71b 100644
--- a/UI/window-basic-preview.cpp
+++ b/UI/window-basic-preview.cpp
@@ -13,9 +13,6 @@
 
 #define HANDLE_RADIUS 4.0f
 #define HANDLE_SEL_RADIUS (HANDLE_RADIUS * 1.5f)
-#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
-#define SUPPORTS_FRACTIONAL_SCALING
-#endif
 
 /* TODO: make C++ math classes and clean up code here later */
 
@@ -44,11 +41,7 @@ OBSBasicPreview::~OBSBasicPreview()
 vec2 OBSBasicPreview::GetMouseEventPos(QMouseEvent *event)
 {
 	OBSBasic *main = reinterpret_cast<OBSBasic *>(App()->GetMainWindow());
-#ifdef SUPPORTS_FRACTIONAL_SCALING
 	float pixelRatio = main->devicePixelRatioF();
-#else
-	float pixelRatio = main->devicePixelRatio();
-#endif
 	float scale = pixelRatio / main->previewScale;
 	vec2 pos;
 	vec2_set(&pos,
@@ -406,11 +399,7 @@ void OBSBasicPreview::GetStretchHandleData(const vec2 &pos, bool ignoreGroup)
 	if (!scene)
 		return;
 
-#ifdef SUPPORTS_FRACTIONAL_SCALING
 	float scale = main->previewScale / main->devicePixelRatioF();
-#else
-	float scale = main->previewScale / main->devicePixelRatio();
-#endif
 	vec2 scaled_pos = pos;
 	vec2_divf(&scaled_pos, &scaled_pos, scale);
 	HandleFindData data(scaled_pos, scale);
@@ -533,11 +522,7 @@ void OBSBasicPreview::mousePressEvent(QMouseEvent *event)
 	}
 
 	OBSBasic *main = reinterpret_cast<OBSBasic *>(App()->GetMainWindow());
-#ifdef SUPPORTS_FRACTIONAL_SCALING
 	float pixelRatio = main->devicePixelRatioF();
-#else
-	float pixelRatio = main->devicePixelRatio();
-#endif
 	float x = float(event->x()) - main->previewX / pixelRatio;
 	float y = float(event->y()) - main->previewY / pixelRatio;
 	Qt::KeyboardModifiers modifiers = QGuiApplication::keyboardModifiers();
@@ -1552,11 +1537,7 @@ void OBSBasicPreview::mouseMoveEvent(QMouseEvent *event)
 			mousePos = pos;
 			OBSBasic *main = reinterpret_cast<OBSBasic *>(
 				App()->GetMainWindow());
-#ifdef SUPPORTS_FRACTIONAL_SCALING
 			float scale = main->devicePixelRatioF();
-#else
-			float scale = main->devicePixelRatio();
-#endif
 			float x = float(event->x()) - main->previewX / scale;
 			float y = float(event->y()) - main->previewY / scale;
 			vec2_set(&startPos, x, y);