diff --git a/Sources/_TestingInternals/ExecutablePath.cpp b/Sources/_TestingInternals/ExecutablePath.cpp
index 7213cfa75..82297b452 100644
--- a/Sources/_TestingInternals/ExecutablePath.cpp
+++ b/Sources/_TestingInternals/ExecutablePath.cpp
@@ -29,8 +29,12 @@ static void captureEarlyCWD(void) {
     earlyCWD.store(buffer);
   }
 }
+#endif
 
 const char *swt_getEarlyCWD(void) {
+#if defined(__OpenBSD__)
   return earlyCWD.load();
-}
+#else
+  return nullptr;
 #endif
+}
diff --git a/Sources/_TestingInternals/include/ExecutablePath.h b/Sources/_TestingInternals/include/ExecutablePath.h
index 22f3acc62..dfa9b1e7e 100644
--- a/Sources/_TestingInternals/include/ExecutablePath.h
+++ b/Sources/_TestingInternals/include/ExecutablePath.h
@@ -16,15 +16,15 @@
 
 SWT_ASSUME_NONNULL_BEGIN
 
-#if defined(__OpenBSD__)
 /// Get the current working directory as it was set shortly after the process
 /// started and before `main()` has been called.
 ///
 /// This function is necessary on OpenBSD so that we can (as correctly as
 /// possible) resolve the executable path when the first argument is a relative
 /// path (which can occur when manually invoking the test executable.)
+///
+/// On all other platforms, this function always returns `nullptr`.
 SWT_EXTERN const char *_Nullable swt_getEarlyCWD(void);
-#endif
 
 SWT_ASSUME_NONNULL_END