diff --git a/ffmpeg.h b/ffmpeg.h
index 74d411c5..dac5ee12 100644
--- a/ffmpeg.h
+++ b/ffmpeg.h
@@ -20,9 +20,9 @@ class FFmpegThread : public cThread {
 
 private:
 	cCondWait cw;
-	bool touch;
+	bool touch = false;
 	int targetChannel;
-	int vOption;
+	int vOption = 0;
 	std::string session;
 };
 
@@ -32,7 +32,7 @@ class FFmpegThread : public cThread {
 class cPipe2 {
 private:
 	pid_t pid;
-	bool terminated;
+	bool terminated = false;
 	FILE *f;
 public:
 	cPipe2(void);
diff --git a/md5.h b/md5.h
index 65cb1258..1d425612 100644
--- a/md5.h
+++ b/md5.h
@@ -88,8 +88,8 @@ class md5
 private:
 	uint4		m_State[4];
 	uint4		m_Count[2];
-	uchar		m_Buffer[64];
-	uchar		m_Digest[16];
-	uchar		m_Finalized;
+	uchar		m_Buffer[64] = {0};
+	uchar		m_Digest[16] = {0};
+	uchar		m_Finalized = 0;
 
 };
diff --git a/timers.h b/timers.h
index 2fb0a46e..430c6113 100644
--- a/timers.h
+++ b/timers.h
@@ -84,7 +84,7 @@ namespace vdrlive {
 			TimerList m_updateTimers;
 			ErrorList m_failedUpdates;
 			cCondVar m_updateWait;
-			bool m_reloadTimers;
+			bool m_reloadTimers = false;
 
 			void DoUpdateTimers();
 			void DoInsertTimer( timerStruct& timerData );