diff --git a/internal/compiler/generator/cpp.rs b/internal/compiler/generator/cpp.rs
index 2726302cc37..995f0a88443 100644
--- a/internal/compiler/generator/cpp.rs
+++ b/internal/compiler/generator/cpp.rs
@@ -3268,6 +3268,7 @@ fn compile_expression(expr: &llr::Expression, ctx: &EvaluationContext) -> String
                         '&' => "&&",
                         '|' => "||",
                         '/' => "/(float)",
+                        '-' => "-(float)", // conversion to float to avoid overflow between unsigned
                         _ => op.encode_utf8(&mut buffer),
                     },
                 )
diff --git a/tests/cases/elements/image.slint b/tests/cases/elements/image.slint
index 61e442bac0f..01398a289c8 100644
--- a/tests/cases/elements/image.slint
+++ b/tests/cases/elements/image.slint
@@ -21,8 +21,9 @@ TestCase := Rectangle {
 
     property <length> img_width: img.width;
     property <length> img_height: img.height;
+    in-out property <float> test_no_overflow: (21 - img.source.width) / 2; // (21 - 320)/2 = -149.5
     property <bool> test: img2.source-clip-height * 1px == img2.height && img2.source-clip-width * 1px == img2.width &&
-         img2.width/1px == img2.source.width - 20 && img3.source.width == 0 && img3.source.height == 0;
+         img2.width/1px == img2.source.width - 20 && img3.source.width == 0 && img3.source.height == 0 && test_no_overflow == -149.5;
 }
 
 /*