diff --git a/wpilibc/wpilibC++Devices/include/DigitalInput.h b/wpilibc/wpilibC++Devices/include/DigitalInput.h
index a6c69a954a..d019fba1a8 100644
--- a/wpilibc/wpilibC++Devices/include/DigitalInput.h
+++ b/wpilibc/wpilibC++Devices/include/DigitalInput.h
@@ -40,7 +40,6 @@ class DigitalInput : public DigitalSource, public LiveWindowSendable {
 
  private:
   uint32_t m_channel;
-  bool m_lastValue;
 
   ITable *m_table = nullptr;
 };
diff --git a/wpilibc/wpilibC++Devices/src/CANJaguar.cpp b/wpilibc/wpilibC++Devices/src/CANJaguar.cpp
index 2bad4a0daf..c99994baf9 100644
--- a/wpilibc/wpilibC++Devices/src/CANJaguar.cpp
+++ b/wpilibc/wpilibC++Devices/src/CANJaguar.cpp
@@ -663,7 +663,7 @@ void CANJaguar::verify() {
   }
 
   if (!m_pVerified) {
-    uint32_t message;
+    uint32_t message = 0;
 
     if (m_controlMode == kSpeed)
       message = LM_API_SPD_PC;
@@ -693,7 +693,7 @@ void CANJaguar::verify() {
   }
 
   if (!m_iVerified) {
-    uint32_t message;
+    uint32_t message = 0;
 
     if (m_controlMode == kSpeed)
       message = LM_API_SPD_IC;
@@ -723,7 +723,7 @@ void CANJaguar::verify() {
   }
 
   if (!m_dVerified) {
-    uint32_t message;
+    uint32_t message = 0;
 
     if (m_controlMode == kSpeed)
       message = LM_API_SPD_DC;
diff --git a/wpilibc/wpilibC++Devices/src/Preferences.cpp b/wpilibc/wpilibC++Devices/src/Preferences.cpp
index e7d395820e..75754eb873 100644
--- a/wpilibc/wpilibC++Devices/src/Preferences.cpp
+++ b/wpilibc/wpilibC++Devices/src/Preferences.cpp
@@ -336,9 +336,9 @@ std::string Preferences::Get(const char *key) {
   Synchronized sync(m_tableLock);
   if (key == nullptr) {
     wpi_setWPIErrorWithContext(NullParameter, "key");
-    return std::string("");
+    return "";
   }
-  return m_values[std::string(key)];
+  return m_values[key];
 }
 
 /**