diff --git a/include/input/Input.h b/include/input/Input.h
index 55787e7..cfcafab 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -398,7 +398,7 @@
 
     inline int32_t getButtonState() const { return mButtonState; }
 
-    inline int32_t setButtonState(int32_t buttonState) { mButtonState = buttonState; }
+    inline void setButtonState(int32_t buttonState) { mButtonState = buttonState; }
 
     inline int32_t getActionButton() const { return mActionButton; }
 
diff --git a/include/input/InputEventLabels.h b/include/input/InputEventLabels.h
index b7012eb..b59728a 100644
--- a/include/input/InputEventLabels.h
+++ b/include/input/InputEventLabels.h
@@ -421,30 +421,30 @@
     return NULL;
 }
 
-static int32_t getKeyCodeByLabel(const char* label) {
+static inline int32_t getKeyCodeByLabel(const char* label) {
     return int32_t(lookupValueByLabel(label, KEYCODES));
 }
 
-static const char* getLabelByKeyCode(int32_t keyCode) {
-    if (keyCode >= 0 && keyCode < size(KEYCODES)) {
+static inline const char* getLabelByKeyCode(int32_t keyCode) {
+    if (keyCode >= 0 && keyCode < static_cast<int32_t>(size(KEYCODES))) {
         return KEYCODES[keyCode].literal;
     }
     return NULL;
 }
 
-static uint32_t getKeyFlagByLabel(const char* label) {
+static inline uint32_t getKeyFlagByLabel(const char* label) {
     return uint32_t(lookupValueByLabel(label, FLAGS));
 }
 
-static int32_t getAxisByLabel(const char* label) {
+static inline int32_t getAxisByLabel(const char* label) {
     return int32_t(lookupValueByLabel(label, AXES));
 }
 
-static const char* getAxisLabel(int32_t axisId) {
+static inline const char* getAxisLabel(int32_t axisId) {
     return lookupLabelByValue(axisId, AXES);
 }
 
-static int32_t getLedByLabel(const char* label) {
+static inline int32_t getLedByLabel(const char* label) {
     return int32_t(lookupValueByLabel(label, LEDS));
 }