diff --git a/hal/src/main/native/athena/LEDs.cpp b/hal/src/main/native/athena/LEDs.cpp
index 1009208fa26..f276db2be96 100644
--- a/hal/src/main/native/athena/LEDs.cpp
+++ b/hal/src/main/native/athena/LEDs.cpp
@@ -28,6 +28,7 @@ static const fs::path radioLEDRedFilePath =
 static const char* onStr = "1";
 static const char* offStr = "0";
 
+extern "C" {
 void HAL_SetRadioLEDState(HAL_RadioLEDState state, int32_t* status) {
   std::error_code ec;
   fs::file_t greenFile = fs::OpenFileForWrite(radioLEDGreenFilePath, ec,
@@ -49,3 +50,5 @@ void HAL_SetRadioLEDState(HAL_RadioLEDState state, int32_t* status) {
   fs::CloseFile(greenFile);
   fs::CloseFile(redFile);
 }
+
+}  // extern "C"
diff --git a/hal/src/main/native/cpp/jni/LEDJNI.cpp b/hal/src/main/native/cpp/jni/LEDJNI.cpp
index e204c06c360..db3f842bf15 100644
--- a/hal/src/main/native/cpp/jni/LEDJNI.cpp
+++ b/hal/src/main/native/cpp/jni/LEDJNI.cpp
@@ -18,6 +18,8 @@ static_assert(edu_wpi_first_hal_LEDJNI_RADIO_LED_STATE_ORANGE ==
               HAL_RadioLEDState::HAL_RadioLED_kOrange);
 
 using namespace hal;
+
+extern "C" {
 /*
  * Class:     edu_wpi_first_hal_LEDJNI
  * Method:    setRadioLEDState
@@ -31,3 +33,4 @@ Java_edu_wpi_first_hal_LEDJNI_setRadioLEDState
   HAL_SetRadioLEDState(static_cast<HAL_RadioLEDState>(state), &status);
   CheckStatus(env, status);
 }
+}  // extern "C"
diff --git a/hal/src/main/native/include/hal/LEDs.h b/hal/src/main/native/include/hal/LEDs.h
index 19e4122748d..3737b7df158 100644
--- a/hal/src/main/native/include/hal/LEDs.h
+++ b/hal/src/main/native/include/hal/LEDs.h
@@ -8,9 +8,16 @@
 HAL_ENUM(HAL_RadioLEDState){HAL_RadioLED_kOff = 0, HAL_RadioLED_kGreen = 1,
                             HAL_RadioLED_kRed = 2, HAL_RadioLED_kOrange = 3};
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 /**
  * Set the state of the "Radio" LED.
  * @param state The state to set the LED to.
  * @param[out] status the error code, or 0 for success
  */
 void HAL_SetRadioLEDState(HAL_RadioLEDState state, int32_t* status);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
diff --git a/hal/src/main/native/sim/LEDs.cpp b/hal/src/main/native/sim/LEDs.cpp
index c31619839df..59f41edab69 100644
--- a/hal/src/main/native/sim/LEDs.cpp
+++ b/hal/src/main/native/sim/LEDs.cpp
@@ -10,6 +10,10 @@ namespace hal::init {
 void InitializeLEDs() {}
 }  // namespace hal::init
 
+extern "C" {
+
 void HAL_SetRadioLEDState(HAL_RadioLEDState state, int32_t* status) {
   HALSIM_SetRoboRioRadioLEDState(state);
 }
+
+}  // extern "C"