diff --git a/host/include/interface/platform.h b/host/include/interface/platform.h
index 23fe215f..568bc619 100644
--- a/host/include/interface/platform.h
+++ b/host/include/interface/platform.h
@@ -35,17 +35,17 @@
 #define LG_HOST_EXIT_FATAL   0x50
 
 int  app_main(int argc, char * argv[]);
-bool app_init();
-void app_shutdown();
-void app_quit();
+bool app_init(void);
+void app_shutdown(void);
+void app_quit(void);
 
 // these must be implemented for each OS
-const char * os_getExecutable();
-const char * os_getDataPath();
+const char * os_getExecutable(void);
+const char * os_getDataPath(void);
 void os_showMessage(const char * caption, const char * msg);
 
 bool os_getAndClearPendingActivationRequest(void);
-bool os_blockScreensaver();
+bool os_blockScreensaver(void);
 bool os_hasSetCursorPos(void);
 void os_setCursorPos(int x, int y);
 
diff --git a/host/platform/Linux/src/platform.c b/host/platform/Linux/src/platform.c
index 83fb4f89..ee4d03d3 100644
--- a/host/platform/Linux/src/platform.c
+++ b/host/platform/Linux/src/platform.c
@@ -87,7 +87,7 @@ bool os_getAndClearPendingActivationRequest(void)
   return false;
 }
 
-bool os_blockScreensaver()
+bool os_blockScreensaver(void)
 {
   return false;
 }
@@ -111,7 +111,7 @@ KVMFROS os_getKVMFRType(void)
   return KVMFR_OS_LINUX;
 }
 
-static const char * getPrettyName()
+static const char * getPrettyName(void)
 {
   static char buffer[256];
 
diff --git a/host/platform/Windows/src/platform.c b/host/platform/Windows/src/platform.c
index adc4a90b..a734f112 100644
--- a/host/platform/Windows/src/platform.c
+++ b/host/platform/Windows/src/platform.c
@@ -300,7 +300,7 @@ const char *getSystemLogDirectory(void)
   return app.systemLogDir;
 }
 
-static void populateSystemLogDirectory()
+static void populateSystemLogDirectory(void)
 {
   char programData[MAX_PATH];
   if (GetEnvironmentVariableA("ProgramData", programData, sizeof(programData)) &&
@@ -593,7 +593,7 @@ bool os_getAndClearPendingActivationRequest(void)
   return atomic_exchange(&app.hasPendingActivationRequest, false);
 }
 
-bool os_blockScreensaver()
+bool os_blockScreensaver(void)
 {
   static bool      lastResult = false;
   static ULONGLONG lastCheck  = 0;
diff --git a/host/platform/Windows/src/service.c b/host/platform/Windows/src/service.c
index 35ef0af6..01611055 100644
--- a/host/platform/Windows/src/service.c
+++ b/host/platform/Windows/src/service.c
@@ -58,7 +58,7 @@ struct Service service = { 0 };
 
 char logTime[100];
 
-char * currentTime()
+char * currentTime(void)
 {
   time_t t = time(NULL);
   strftime(logTime, sizeof logTime, "%Y-%m-%d %H:%M:%S", localtime(&t));
diff --git a/host/src/app.c b/host/src/app.c
index 6695323b..4acabedd 100644
--- a/host/src/app.c
+++ b/host/src/app.c
@@ -510,7 +510,7 @@ void capturePostPointerBuffer(CapturePointer pointer)
   LG_UNLOCK(app.pointerLock);
 }
 
-static void lgmpShutdown()
+static void lgmpShutdown(void)
 {
   if (app.lgmpTimer)
     lgTimerDestroy(app.lgmpTimer);