diff --git a/src/bin/cargo-miri.rs b/src/bin/cargo-miri.rs
index 8f26aaf4e9..9ef4996992 100644
--- a/src/bin/cargo-miri.rs
+++ b/src/bin/cargo-miri.rs
@@ -6,7 +6,7 @@ use std::ops::Not;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 
-const XARGO_MIN_VERSION: (u32, u32, u32) = (0, 3, 19);
+const XARGO_MIN_VERSION: (u32, u32, u32) = (0, 3, 20);
 
 const CARGO_MIRI_HELP: &str = r#"Interprets bin crates and tests in Miri
 
diff --git a/travis.sh b/travis.sh
index 8b2453584b..590b94b7f5 100755
--- a/travis.sh
+++ b/travis.sh
@@ -44,4 +44,6 @@ if [ "$TRAVIS_OS_NAME" == linux ]; then
 elif [ "$TRAVIS_OS_NAME" == osx ]; then
   # cross-test 64bit Windows from macOS
   MIRI_TEST_TARGET=x86_64-pc-windows-msvc run_tests
+  # cross-test 32bit GNU Windows from macOS
+  MIRI_TEST_TARGET=i686-pc-windows-gnu run_tests
 fi