diff --git a/ci/script.sh b/ci/script.sh
index 5c898a8668..e87e50a8db 100644
--- a/ci/script.sh
+++ b/ci/script.sh
@@ -37,8 +37,11 @@ main() {
     mkdir -p ci/builds
 
     if [ $T = x86_64-unknown-linux-gnu ]; then
-        # compile-fail tests
-        cargo test --test single --target $T
+        if [ $TRAVIS_RUST_VERSION == 1.*.* ]; then
+            # test on a fixed version (MSRV) to avoid problems with changes in rustc diagnostics
+            # compile-fail tests
+            cargo test --test single --target $T
+        fi
 
         if [ $TRAVIS_RUST_VERSION = nightly ]; then
             # multi-core compile-pass tests
diff --git a/ui/single/task-priority-too-high.stderr b/ui/single/task-priority-too-high.stderr
index 0e0b1cb26e..98b5d657c9 100644
--- a/ui/single/task-priority-too-high.stderr
+++ b/ui/single/task-priority-too-high.stderr
@@ -4,7 +4,7 @@ warning: unused import: `rtfm::app`
 3 | use rtfm::app;
   |     ^^^^^^^^^
   |
-  = note: `#[warn(unused_imports)]` on by default
+  = note: #[warn(unused_imports)] on by default
 
 error[E0080]: evaluation of constant value failed
  --> $DIR/task-priority-too-high.rs:5:1