diff --git a/src/zapit/src/scanbat.cpp b/src/zapit/src/scanbat.cpp
index 49e731568..79e3a1b24 100644
--- a/src/zapit/src/scanbat.cpp
+++ b/src/zapit/src/scanbat.cpp
@@ -82,7 +82,7 @@ bool CBat::Read()
 	int secdone[255];
 	int sectotal = -1;
 
-	memset(secdone, 0, 255);
+	memset(secdone, 0, sizeof(secdone));
 
 	cDemux * dmx = new cDemux(dmxnum);
 	dmx->Open(DMX_PSI_CHANNEL);
diff --git a/src/zapit/src/scansdt.cpp b/src/zapit/src/scansdt.cpp
index 5ff2aa358..9114a0eea 100644
--- a/src/zapit/src/scansdt.cpp
+++ b/src/zapit/src/scansdt.cpp
@@ -68,7 +68,7 @@ bool CSdt::Read()
 	int sectotal = -1;
 	bool cable_hack_done = false;
 
-	memset(secdone, 0, 255);
+	memset(secdone, 0, sizeof(secdone));
 	cDemux * dmx = new cDemux(dmxnum);
 	dmx->Open(DMX_PSI_CHANNEL);