diff --git a/tests/ui/backtrace/dylib-dep.rs b/tests/ui/backtrace/dylib-dep.rs
index fcd1f92e28ebc..a41931ad54891 100644
--- a/tests/ui/backtrace/dylib-dep.rs
+++ b/tests/ui/backtrace/dylib-dep.rs
@@ -9,6 +9,7 @@
 //@ ignore-musl musl doesn't support dynamic libraries (at least when the original test was written).
 //@ needs-unwind
 //@ compile-flags: -g -Copt-level=0 -Cstrip=none -Cforce-frame-pointers=yes
+//@ ignore-emscripten Requires custom symbolization code
 //@ aux-crate: dylib_dep_helper=dylib-dep-helper.rs
 //@ aux-crate: auxiliary=dylib-dep-helper-aux.rs
 //@ run-pass
diff --git a/tests/ui/backtrace/line-tables-only.rs b/tests/ui/backtrace/line-tables-only.rs
index 044f59e483ab4..6624c71e184b0 100644
--- a/tests/ui/backtrace/line-tables-only.rs
+++ b/tests/ui/backtrace/line-tables-only.rs
@@ -10,6 +10,7 @@
 //@ compile-flags: -Cstrip=none -Cdebuginfo=line-tables-only
 //@ ignore-android FIXME #17520
 //@ ignore-fuchsia Backtraces not symbolized
+//@ ignore-emscripten Requires custom symbolization code
 //@ needs-unwind
 //@ aux-build: line-tables-only-helper.rs