diff --git a/tests/ui/missing_colon.stderr b/tests/ui/missing_colon.stderr
index 1c98401..3e48b5c 100644
--- a/tests/ui/missing_colon.stderr
+++ b/tests/ui/missing_colon.stderr
@@ -4,7 +4,7 @@ error: unexpected end of macro invocation
 13 |     json!({ "a" });
    |     ^^^^^^^^^^^^^^^
    |
-   = note: this error originates in a macro outside of the current crate (run with -Z external-macro-backtrace for more info)
+   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
 
 error: aborting due to previous error
 
diff --git a/tests/ui/missing_value.stderr b/tests/ui/missing_value.stderr
index 9ebc669..3dda25c 100644
--- a/tests/ui/missing_value.stderr
+++ b/tests/ui/missing_value.stderr
@@ -4,7 +4,7 @@ error: unexpected end of macro invocation
 13 |     json!({ "a" : });
    |     ^^^^^^^^^^^^^^^^^
    |
-   = note: this error originates in a macro outside of the current crate (run with -Z external-macro-backtrace for more info)
+   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
 
 error: aborting due to previous error
 
diff --git a/tests/ui/parse_expr.stderr b/tests/ui/parse_expr.stderr
index 74b1d0e..c116988 100644
--- a/tests/ui/parse_expr.stderr
+++ b/tests/ui/parse_expr.stderr
@@ -4,7 +4,7 @@ error: unexpected end of macro invocation
 13 |     json!({ "a" : ~ });
    |     ^^^^^^^^^^^^^^^^^^^
    |
-   = note: this error originates in a macro outside of the current crate (run with -Z external-macro-backtrace for more info)
+   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
 
 error: aborting due to previous error