diff --git a/src/decode-pppoe.c b/src/decode-pppoe.c
index 073c2c9dda..a0cafeb009 100644
--- a/src/decode-pppoe.c
+++ b/src/decode-pppoe.c
@@ -277,6 +277,10 @@ static int DecodePPPOEtest03 (void)   {
     ThreadVars tv;
     DecodeThreadVars dtv;
 
+    memset(&tv, 0, sizeof(ThreadVars));
+    memset(&p, 0, sizeof(Packet));
+    memset(&dtv, 0, sizeof(DecodeThreadVars));
+
     DecodePPPOEDiscovery(&tv, &dtv, &p, raw_pppoe, sizeof(raw_pppoe), NULL);
 
     return 0; // TODO
@@ -298,6 +302,10 @@ static int DecodePPPOEtest04 (void)   {
     ThreadVars tv;
     DecodeThreadVars dtv;
 
+    memset(&tv, 0, sizeof(ThreadVars));
+    memset(&p, 0, sizeof(Packet));
+    memset(&dtv, 0, sizeof(DecodeThreadVars));
+
     DecodePPPOEDiscovery(&tv, &dtv, &p, raw_pppoe, sizeof(raw_pppoe), NULL);
 
     if(DECODER_ISSET_EVENT(&p,PPPOE_WRONG_CODE))  {
@@ -325,6 +333,10 @@ static int DecodePPPOEtest05 (void)   {
     ThreadVars tv;
     DecodeThreadVars dtv;
 
+    memset(&tv, 0, sizeof(ThreadVars));
+    memset(&p, 0, sizeof(Packet));
+    memset(&dtv, 0, sizeof(DecodeThreadVars));
+
     DecodePPPOEDiscovery(&tv, &dtv, &p, raw_pppoe, sizeof(raw_pppoe), NULL);
 
     if(DECODER_ISSET_EVENT(&p,PPPOE_MALFORMED_TAGS))  {