diff --git a/src/zma.cpp b/src/zma.cpp
index 1dfd7716b..722582c97 100644
--- a/src/zma.cpp
+++ b/src/zma.cpp
@@ -36,6 +36,8 @@ void Usage()
 
 int main( int argc, char *argv[] )
 {
+    srand( getpid() * time( 0 ) );
+
 	int id = -1;
 
 	static struct option long_options[] = {
diff --git a/src/zmc.cpp b/src/zmc.cpp
index 9839a032c..41250c1c1 100644
--- a/src/zmc.cpp
+++ b/src/zmc.cpp
@@ -42,6 +42,8 @@ void Usage()
 
 int main( int argc, char *argv[] )
 {
+	srand( getpid() * time( 0 ) );
+
 	const char *device = "";
 	const char *protocol = "";
 	const char *host = "";
diff --git a/src/zmf.cpp b/src/zmf.cpp
index d5d58f132..7e890951e 100644
--- a/src/zmf.cpp
+++ b/src/zmf.cpp
@@ -104,6 +104,8 @@ void Usage()
 
 int main( int argc, char *argv[] )
 {
+    srand( getpid() * time( 0 ) );
+
 	int id = -1;
 
 	static struct option long_options[] = {
diff --git a/src/zms.cpp b/src/zms.cpp
index a8aa3e29c..041eb59b3 100644
--- a/src/zms.cpp
+++ b/src/zms.cpp
@@ -52,6 +52,8 @@ bool ValidateAccess( User *user, int mon_id )
 
 int main( int argc, const char *argv[] )
 {
+    srand( getpid() * time( 0 ) );
+
 	enum { ZMS_MONITOR, ZMS_EVENT } source = ZMS_MONITOR;
 	enum { ZMS_JPEG, ZMS_MPEG, ZMS_RAW, ZMS_ZIP, ZMS_SINGLE } mode = ZMS_JPEG;
 	char format[32] = "";
diff --git a/src/zmu.cpp b/src/zmu.cpp
index 61a648955..c51c1c3ed 100644
--- a/src/zmu.cpp
+++ b/src/zmu.cpp
@@ -138,6 +138,8 @@ bool ValidateAccess( User *user, int mon_id, int function )
 
 int main( int argc, char *argv[] )
 {
+    srand( getpid() * time( 0 ) );
+
 	static struct option long_options[] = {
 		{"device", 2, 0, 'd'},
 		{"monitor", 1, 0, 'm'},