diff --git a/crates/re_types/tests/image.rs b/crates/re_types/tests/image.rs
index 438a1a3a68a9..b963dc5d5d0f 100644
--- a/crates/re_types/tests/image.rs
+++ b/crates/re_types/tests/image.rs
@@ -26,7 +26,7 @@ fn image_roundtrip() {
         }
         .into(),
         draw_order: None,
-        opacity: Some(123.0.into()),
+        opacity: None,
     }];
 
     let all_arch_serialized = [Image::try_from(ndarray::array![[1u8, 2, 3], [4, 5, 6]])
@@ -89,7 +89,7 @@ fn dynamic_image_roundtrip() {
         }
         .into(),
         draw_order: None,
-        opacity: Some(123.0.into()),
+        opacity: None,
     }];
 
     let mut img = RgbImage::new(3, 2);
diff --git a/crates/re_types/tests/segmentation_image.rs b/crates/re_types/tests/segmentation_image.rs
index 8cb585cc297a..4af0187bfa66 100644
--- a/crates/re_types/tests/segmentation_image.rs
+++ b/crates/re_types/tests/segmentation_image.rs
@@ -26,7 +26,7 @@ fn segmentation_image_roundtrip() {
         }
         .into(),
         draw_order: None,
-        opacity: Some(123.0.into()),
+        opacity: None,
     }];
 
     let all_arch_serialized = [SegmentationImage::try_from(ndarray::array![