diff --git a/hal/include/HAL/Accelerometer.h b/hal/include/HAL/Accelerometer.h
index 76bb0caf8c..ca485cce78 100644
--- a/hal/include/HAL/Accelerometer.h
+++ b/hal/include/HAL/Accelerometer.h
@@ -9,7 +9,7 @@
 
 #include "HAL/Types.h"
 
-enum HAL_AccelerometerRange {
+enum HAL_AccelerometerRange : int32_t {
   HAL_AccelerometerRange_k2G = 0,
   HAL_AccelerometerRange_k4G = 1,
   HAL_AccelerometerRange_k8G = 2,
diff --git a/hal/include/HAL/AnalogTrigger.h b/hal/include/HAL/AnalogTrigger.h
index d4c0f6c54a..d6a522ace4 100644
--- a/hal/include/HAL/AnalogTrigger.h
+++ b/hal/include/HAL/AnalogTrigger.h
@@ -11,7 +11,7 @@
 
 #include "HAL/Types.h"
 
-enum HAL_AnalogTriggerType {
+enum HAL_AnalogTriggerType : int32_t {
   HAL_Trigger_kInWindow = 0,
   HAL_Trigger_kState = 1,
   HAL_Trigger_kRisingPulse = 2,
diff --git a/hal/include/HAL/Counter.h b/hal/include/HAL/Counter.h
index 720886f863..5ecf95cd91 100644
--- a/hal/include/HAL/Counter.h
+++ b/hal/include/HAL/Counter.h
@@ -12,7 +12,7 @@
 #include "HAL/AnalogTrigger.h"
 #include "HAL/Types.h"
 
-enum HAL_Counter_Mode {
+enum HAL_Counter_Mode : int32_t {
   HAL_Counter_kTwoPulse = 0,
   HAL_Counter_kSemiperiod = 1,
   HAL_Counter_kPulseLength = 2,
diff --git a/hal/include/HAL/DriverStation.h b/hal/include/HAL/DriverStation.h
index 8505ddbaf7..ba97aea7da 100644
--- a/hal/include/HAL/DriverStation.h
+++ b/hal/include/HAL/DriverStation.h
@@ -37,7 +37,7 @@ struct HAL_ControlWord {
   uint32_t control_reserved : 26;
 };
 
-enum HAL_AllianceStationID {
+enum HAL_AllianceStationID : int32_t {
   HAL_AllianceStationID_kRed1,
   HAL_AllianceStationID_kRed2,
   HAL_AllianceStationID_kRed3,
diff --git a/hal/include/HAL/Encoder.h b/hal/include/HAL/Encoder.h
index 1af0f88fa2..94f78905fa 100644
--- a/hal/include/HAL/Encoder.h
+++ b/hal/include/HAL/Encoder.h
@@ -12,13 +12,13 @@
 #include "HAL/AnalogTrigger.h"
 #include "HAL/Types.h"
 
-enum HAL_EncoderIndexingType {
+enum HAL_EncoderIndexingType : int32_t {
   HAL_kResetWhileHigh,
   HAL_kResetWhileLow,
   HAL_kResetOnFallingEdge,
   HAL_kResetOnRisingEdge
 };
-enum HAL_EncoderEncodingType {
+enum HAL_EncoderEncodingType : int32_t {
   HAL_Encoder_k1X,
   HAL_Encoder_k2X,
   HAL_Encoder_k4X