diff --git a/test/test_ds18b20/test_main.cpp b/test/test_ds18b20/test_main.cpp
index 27f37c0eb..ff2db2c9e 100644
--- a/test/test_ds18b20/test_main.cpp
+++ b/test/test_ds18b20/test_main.cpp
@@ -37,6 +37,7 @@ void test_recognizes_resolution_configuration()
     TEST_ASSERT_FALSE(ds18b20::hasResolution(scratchpad, 12));
 }
 
+extern "C" {
 void setup()
 {
     UNITY_BEGIN();
@@ -48,3 +49,4 @@ void setup()
 }
 
 void loop() {}
+}