diff --git a/TORoundedButton/TORoundedButton.h b/TORoundedButton/TORoundedButton.h
index ed5b2fe..55630b5 100644
--- a/TORoundedButton/TORoundedButton.h
+++ b/TORoundedButton/TORoundedButton.h
@@ -25,7 +25,6 @@
 NS_ASSUME_NONNULL_BEGIN
 
 @class TORoundedButton;
-@class UICornerConfiguration;
 
 NS_SWIFT_NAME(RoundedButtonDelegate)
 @protocol TORoundedButtonDelegate <NSObject>
@@ -42,9 +41,11 @@ IB_DESIGNABLE @interface TORoundedButton : UIControl
 /// A delegate object that can receive tap events from this button.
 @property (nonatomic, weak) id<TORoundedButtonDelegate> delegate;
 
+#ifdef __IPHONE_26_0
 /// The corner-rounding behaviour of the button's boundaries.
 /// On iOS 26 and above, this is the `.capsule` preset by default.
 @property (nonatomic, strong, nullable) UICornerConfiguration *cornerConfiguration API_AVAILABLE(ios(26.0));
+#endif
 
 /// The radius of the corners of this button.
 /// (Default is 12.0f on iOS 18 and below. For iOS 26.0, changing this property will update `cornerConfiguration`.)
diff --git a/TORoundedButton/TORoundedButton.m b/TORoundedButton/TORoundedButton.m
index 96646d8..14e36b2 100644
--- a/TORoundedButton/TORoundedButton.m
+++ b/TORoundedButton/TORoundedButton.m
@@ -134,11 +134,15 @@ - (void)_roundedButtonCommonInit TOROUNDEDBUTTON_OBJC_DIRECT {
     [self addTarget:self action:@selector(_didDragInside) forControlEvents:UIControlEventTouchDragEnter];
 
     // Set the corner radius depending on app version
+#ifdef __IPHONE_26_0
     if (@available(iOS 26.0, *)) {
         self.cornerConfiguration = [UICornerConfiguration capsuleConfiguration];
     } else {
         _cornerRadius = (_cornerRadius > FLT_EPSILON) ?: 12.0f;
     }
+#else
+    _cornerRadius = (_cornerRadius > FLT_EPSILON) ?: 12.0f;
+#endif
 }
 
 - (void)_makeTitleLabelIfNeeded TOROUNDEDBUTTON_OBJC_DIRECT {
@@ -518,15 +522,20 @@ - (void)setCornerRadius:(CGFloat)cornerRadius {
 
     _cornerRadius = cornerRadius;
 
+#ifdef __IPHONE_26_0
     if (@available(iOS 26.0, *)) {
         UICornerRadius *const radius = [UICornerRadius fixedRadius:_cornerRadius];
         _backgroundView.cornerConfiguration = [UICornerConfiguration configurationWithUniformRadius:radius];
     } else {
         _backgroundView.layer.cornerRadius = _cornerRadius;
     }
+#else
+    _backgroundView.layer.cornerRadius = _cornerRadius;
+#endif
     [self setNeedsLayout];
 }
 
+#ifdef __IPHONE_26_0
 - (void)setCornerConfiguration:(UICornerConfiguration *)cornerConfiguration {
     _backgroundView.cornerConfiguration = cornerConfiguration;
 }
@@ -534,6 +543,7 @@ - (void)setCornerConfiguration:(UICornerConfiguration *)cornerConfiguration {
 - (UICornerConfiguration *)cornerConfiguration {
     return _backgroundView.cornerConfiguration;
 }
+#endif
 
 - (void)setIsTranslucent:(BOOL)isTranslucent {
     if (_isTranslucent == isTranslucent) {
diff --git a/TORoundedButtonExampleTests/TORoundedButtonExampleTests.m b/TORoundedButtonExampleTests/TORoundedButtonExampleTests.m
index a1b1bb0..6b4c6b7 100644
--- a/TORoundedButtonExampleTests/TORoundedButtonExampleTests.m
+++ b/TORoundedButtonExampleTests/TORoundedButtonExampleTests.m
@@ -26,11 +26,15 @@ - (void)testDefaultValues
     XCTAssertEqual(button.tappedTintColorBrightnessOffset, -0.15f);
     XCTAssertEqual(button.tappedButtonScale, 0.97f);
 
+#ifdef __IPHONE_26_0
     if (@available(iOS 26.0, *)) {
         XCTAssertNotNil(button.cornerConfiguration);
     } else {
         XCTAssertEqual(button.cornerRadius, 12.0f);
     }
+#else
+    XCTAssertEqual(button.cornerRadius, 12.0f);
+#endif
 }
 
 - (void)testButtonInteraction