diff --git a/src/Mayaqua/Mayaqua.h b/src/Mayaqua/Mayaqua.h
index 36fdc648..190ad80d 100644
--- a/src/Mayaqua/Mayaqua.h
+++ b/src/Mayaqua/Mayaqua.h
@@ -501,7 +501,6 @@ if (kernel_status_inited) {					\
 #define	KS_FREEFIFO_COUNT		37		// Number of times the FIFO object is deleted
 #define	KS_READ_FIFO_COUNT		38		// Number of calls ReadFifo
 #define	KS_WRITE_FIFO_COUNT		39		// Number of calls WriteFifo
-#define	KS_PEEK_FIFO_COUNT		40		// Number of calls PeekFifo
 // List related
 #define	KS_NEWLIST_COUNT		41		// Number of calls NewList
 #define	KS_FREELIST_COUNT		42		// Number of times the object LIST was deleted
diff --git a/src/Mayaqua/Memory.c b/src/Mayaqua/Memory.c
index bf89ace9..fca27f36 100644
--- a/src/Mayaqua/Memory.c
+++ b/src/Mayaqua/Memory.c
@@ -2011,16 +2011,6 @@ void InsertInt(LIST *o, UINT i)
 
 	Insert(o, Clone(&i, sizeof(UINT)));
 }
-void InsertInt64(LIST *o, UINT64 i)
-{
-	// Validate arguments
-	if (o == NULL)
-	{
-		return;
-	}
-
-	Insert(o, Clone(&i, sizeof(UINT64)));
-}
 
 // Add an integer to the list (no duplicates)
 void AddIntDistinct(LIST *o, UINT i)
@@ -2184,32 +2174,6 @@ LIST *NewListEx2(COMPARE *cmp, bool fast, bool fast_malloc)
 	return o;
 }
 
-// Peek from the FIFO
-UINT PeekFifo(FIFO *f, void *p, UINT size)
-{
-	UINT read_size;
-	if (f == NULL || size == 0)
-	{
-		return 0;
-	}
-
-	// KS
-	KS_INC(KS_PEEK_FIFO_COUNT);
-
-	read_size = MIN(size, f->size);
-	if (read_size == 0)
-	{
-		return 0;
-	}
-
-	if (p != NULL)
-	{
-		Copy(p, (UCHAR *)f->p + f->pos, read_size);
-	}
-
-	return read_size;
-}
-
 // Read all data from FIFO
 BUF *ReadFifoAll(FIFO *f)
 {
@@ -2346,20 +2310,6 @@ void WriteFifo(FIFO *f, void *p, UINT size)
 	KS_INC(KS_WRITE_FIFO_COUNT);
 }
 
-// Add a padding before the head of fifo
-void PadFifoFront(FIFO *f, UINT size)
-{
-	// Validate arguments
-	if (f == NULL || size == 0)
-	{
-		return;
-	}
-
-	f->memsize += size;
-
-	f->p = ReAlloc(f->p, f->memsize);
-}
-
 // Get the current pointer of the FIFO
 UCHAR *GetFifoPointer(FIFO *f)
 {
diff --git a/src/Mayaqua/Memory.h b/src/Mayaqua/Memory.h
index d8bef518..27220fbd 100644
--- a/src/Mayaqua/Memory.h
+++ b/src/Mayaqua/Memory.h
@@ -348,14 +348,12 @@ BUF *ReadRemainBuf(BUF *b);
 UINT ReadBufRemainSize(BUF *b);
 bool CompareBuf(BUF *b1, BUF *b2);
 
-UINT PeekFifo(FIFO *f, void *p, UINT size);
 UINT ReadFifo(FIFO *f, void *p, UINT size);
 BUF *ReadFifoAll(FIFO *f);
 void ShrinkFifoMemory(FIFO *f);
 UCHAR *GetFifoPointer(FIFO *f);
 UCHAR *FifoPtr(FIFO *f);
 void WriteFifo(FIFO *f, void *p, UINT size);
-void PadFifoFront(FIFO *f, UINT size);
 UINT FifoSize(FIFO *f);
 void ReleaseFifo(FIFO *f);
 void CleanupFifo(FIFO *f);
@@ -409,7 +407,6 @@ LIST *NewInt64List(bool sorted);
 int CompareInt(void *p1, void *p2);
 int CompareInt64(void *p1, void *p2);
 void InsertInt(LIST *o, UINT i);
-void InsertInt64(LIST *o, UINT64 i);
 void InsertIntDistinct(LIST *o, UINT i);
 
 void *GetNext(QUEUE *q);