diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff72f13f..8ec1db4c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,9 @@ FlatLaf Change Log
 - FileChooser: Improved performance when navigating to large directories with
   thousands of files. (issue #953)
 - PopupFactory: Fixed NPE on Windows 10 when `owner` is `null`. (issue #952)
+- FlatLaf window decorations: Minimize and maximize icons were not shown for
+  custom scale factors less than 100% (e.g. `-Dflatlaf.uiScale=75%`). (issue
+  #951)
 
 
 ## 3.5.4
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowCloseIcon.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowCloseIcon.java
index 99625d75..a4fd835d 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowCloseIcon.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowCloseIcon.java
@@ -63,7 +63,7 @@ public class FlatWindowCloseIcon
 		int iy = y + ((height - iwh) / 2);
 		int ix2 = ix + iwh - 1;
 		int iy2 = iy + iwh - 1;
-		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
+		float thickness = Math.max( SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor, 1 );
 
 		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD, 4 );
 		path.moveTo( ix, iy );
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowIconifyIcon.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowIconifyIcon.java
index 35d32c20..e7d11cda 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowIconifyIcon.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowIconifyIcon.java
@@ -38,7 +38,7 @@ public class FlatWindowIconifyIcon
 	@Override
 	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
 		int iw = (int) (getSymbolHeight() * scaleFactor);
-		int ih = (int) scaleFactor;
+		int ih = Math.max( (int) scaleFactor, 1 );
 		int ix = x + ((width - iw) / 2);
 		int iy = y + ((height - ih) / 2);
 
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowMaximizeIcon.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowMaximizeIcon.java
index f95f379d..a731c21b 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowMaximizeIcon.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowMaximizeIcon.java
@@ -42,7 +42,7 @@ public class FlatWindowMaximizeIcon
 		int iwh = (int) (getSymbolHeight() * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
-		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
+		float thickness = Math.max( SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor, 1 );
 		int arc = Math.max( (int) (1.5 * scaleFactor), 2 );
 
 		g.fill( SystemInfo.isWindows_11_orLater
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowRestoreIcon.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowRestoreIcon.java
index da2e18bb..4e216495 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowRestoreIcon.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowRestoreIcon.java
@@ -45,7 +45,7 @@ public class FlatWindowRestoreIcon
 		int iwh = (int) (getSymbolHeight() * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
-		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
+		float thickness = Math.max( SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor, 1 );
 		int arc = Math.max( (int) (1.5 * scaleFactor), 2 );
 		int arcOuter = (int) (arc + (1.5 * scaleFactor));