diff --git a/gstreamer-base/src/subclass/base_transform.rs b/gstreamer-base/src/subclass/base_transform.rs
index 48d2f7d46..e2bd788b8 100644
--- a/gstreamer-base/src/subclass/base_transform.rs
+++ b/gstreamer-base/src/subclass/base_transform.rs
@@ -374,9 +374,7 @@ pub trait BaseTransformImplExt: sealed::Sealed + ObjectSubclass {
                         "transform doesn't operate in-place"
                     ))
                 } else {
-                    unreachable!(concat!(
-                        "parent `get_unit_size` called while transform operates in-place"
-                    ))
+                    unreachable!("parent `get_unit_size` called while transform operates in-place")
                 }
             });
 
@@ -501,9 +499,7 @@ pub trait BaseTransformImplExt: sealed::Sealed + ObjectSubclass {
                     if !self.obj().unsafe_cast_ref::<BaseTransform>().is_in_place() {
                         Err(gst::FlowError::NotSupported)
                     } else {
-                        unreachable!(concat!(
-                            "parent `transform` called while transform operates in-place"
-                        ));
+                        unreachable!("parent `transform` called while transform operates in-place");
                     }
                 })
         }
@@ -523,9 +519,9 @@ pub trait BaseTransformImplExt: sealed::Sealed + ObjectSubclass {
                         "transform operates in-place"
                     ));
                 } else {
-                    unreachable!(concat!(
+                    unreachable!(
                         "parent `transform` called while transform doesn't operate in-place"
-                    ));
+                    );
                 }
             });
 
diff --git a/gstreamer-video/src/subclass/video_filter.rs b/gstreamer-video/src/subclass/video_filter.rs
index e820d8b1a..f64688036 100644
--- a/gstreamer-video/src/subclass/video_filter.rs
+++ b/gstreamer-video/src/subclass/video_filter.rs
@@ -99,9 +99,9 @@ pub trait VideoFilterImplExt: sealed::Sealed + ObjectSubclass {
                     {
                         Err(gst::FlowError::NotSupported)
                     } else {
-                        unreachable!(concat!(
+                        unreachable!(
                             "parent `transform_frame` called while transform operates in-place"
-                        ));
+                        );
                     }
                 })
         }
@@ -125,9 +125,9 @@ pub trait VideoFilterImplExt: sealed::Sealed + ObjectSubclass {
                         "transform operates in-place"
                     ));
                 } else {
-                    unreachable!(concat!(
+                    unreachable!(
                         "parent `transform_frame` called while transform doesn't operate in-place"
-                    ));
+                    );
                 }
             });