diff --git a/src/tools/compiletest/src/util.rs b/src/tools/compiletest/src/util.rs
index 1f16a672a98e7..558e9a58697e7 100644
--- a/src/tools/compiletest/src/util.rs
+++ b/src/tools/compiletest/src/util.rs
@@ -45,7 +45,7 @@ impl Utf8PathBufExt for Utf8PathBuf {
 
 /// The name of the environment variable that holds dynamic library locations.
 pub fn dylib_env_var() -> &'static str {
-    if cfg!(windows) {
+    if cfg!(any(windows, target_os = "cygwin")) {
         "PATH"
     } else if cfg!(target_vendor = "apple") {
         "DYLD_LIBRARY_PATH"