diff --git a/hash.c b/hash.c
index 1867c0999c198c..a4f519202f537a 100644
--- a/hash.c
+++ b/hash.c
@@ -3382,9 +3382,18 @@ check_envname(const char *name)
}
#endif
+static void
+check_running_threads(void)
+{
+ if (!rb_thread_alone())
+ rb_raise(rb_eRuntimeError, "cannot setenv() in a multi-threaded program");
+}
+
void
ruby_setenv(const char *name, const char *value)
{
+ check_running_threads();
+
#if defined(_WIN32)
# if defined(MINGW_HAS_SECURE_API) || RUBY_MSVCRT_VERSION >= 80
# define HAVE__WPUTENV_S 1
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