diff --git a/ci/run.sh b/ci/run.sh
index 6fb059d2..314ea088 100755
--- a/ci/run.sh
+++ b/ci/run.sh
@@ -121,6 +121,6 @@ else
 
   cargo test $opt --manifest-path libc-test/Cargo.toml --target "${TARGET}"
 
-  cargo test $opt --features extra_traits --manifest-path libc-test/Cargo.toml \
+  RUST_BACKTRACE=1 cargo test $opt --features extra_traits --manifest-path libc-test/Cargo.toml \
     --target "${TARGET}"
 fi
diff --git a/ci/runtest-android.rs b/ci/runtest-android.rs
index b8030c41..e14dba32 100644
--- a/ci/runtest-android.rs
+++ b/ci/runtest-android.rs
@@ -27,6 +27,7 @@ fn main() {
 
     let output = Command::new("adb")
         .arg("shell")
+        .arg("RUST_BACKTRACE=1")
         .arg(&dst)
         .output()
         .expect("failed to run: adb shell");