diff --git a/apps/iap/iap-core.c b/apps/iap/iap-core.c
index 0b4ad13477..6627259e36 100644
--- a/apps/iap/iap-core.c
+++ b/apps/iap/iap-core.c
@@ -96,7 +96,7 @@ int iap_repeatbtn = 0;
 unsigned int iap_timeoutbtn = 0;
 bool iap_btnrepeat = false, iap_btnshuffle = false;
 
-static long thread_stack[(DEFAULT_STACK_SIZE*6)/sizeof(long)];
+static long thread_stack[(DEFAULT_STACK_SIZE*8)/sizeof(long)];
 static struct event_queue iap_queue;
 
 /* These are pointer used to manage a dynamically allocated buffer which