diff --git a/src/classpath-openjdk.cpp b/src/classpath-openjdk.cpp
index 1385444746..8a2e5e32da 100644
--- a/src/classpath-openjdk.cpp
+++ b/src/classpath-openjdk.cpp
@@ -5917,9 +5917,9 @@ extern "C" AVIAN_EXPORT int64_t JNICALL
   // implementing findJavaTZ_md ourselves from scratch, but that would
   // be a lot of code to implement and maintain.
 
-  object country = arguments[1];
+  GcString* country = cast<GcString>(t, reinterpret_cast<object>(arguments[1]));
 
-  THREAD_RUNTIME_ARRAY(t, char, countryChars, stringLength(t, country) + 1);
+  THREAD_RUNTIME_ARRAY(t, char, countryChars, country->length(t) + 1);
   stringChars(t, country, RUNTIME_ARRAY_BODY(countryChars));
 
   local::MyClasspath* cp = static_cast<local::MyClasspath*>(t->m->classpath);
diff --git a/test/ci.sh b/test/ci.sh
index c6bb76f5f3..b48f0355c1 100755
--- a/test/ci.sh
+++ b/test/ci.sh
@@ -38,7 +38,7 @@ has_flag() {
 
 make_target=test
 
-run_cmake -DCMAKE_BUILD_TYPE=Debug
+test `uname -o` = "Cygwin" || run_cmake -DCMAKE_BUILD_TYPE=Debug
 
 run make jdk-test
 run make ${flags} ${make_target}