diff --git a/eliasfano.h b/eliasfano.h
index 5a730d4..2220492 100644
--- a/eliasfano.h
+++ b/eliasfano.h
@@ -25,13 +25,20 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
+#include <stdint.h>
 
 // compress/decompress integer array with n values to the buffer out. Return value = end of output/input buffer
 unsigned char *efanoenc32(  unsigned      *__restrict in, unsigned n, unsigned char  *__restrict out, unsigned start);
+unsigned char *efanoenc64(  uint64_t      *__restrict in, unsigned n, unsigned char  *__restrict out, uint64_t start);
+
 unsigned char *efanodec32(  unsigned char *__restrict in, unsigned n, unsigned       *__restrict out, unsigned start);
+unsigned char *efanodec64(  unsigned char *__restrict in, unsigned n, uint64_t       *__restrict out, uint64_t start);
 
 unsigned char *efano1enc32( unsigned      *__restrict in, unsigned n, unsigned char  *__restrict out, unsigned start);
+unsigned char *efano1enc64( uint64_t      *__restrict in, unsigned n, unsigned char  *__restrict out, uint64_t start);
+
 unsigned char *efano1dec32( unsigned char *__restrict in, unsigned n, unsigned       *__restrict out, unsigned start);
+unsigned char *efano1dec64( unsigned char *__restrict in, unsigned n, uint64_t       *__restrict out, uint64_t start);
 
 unsigned char *efanoencv32( unsigned      *__restrict in, unsigned n, unsigned char  *__restrict out, unsigned start);
 unsigned char *efanodecv32( unsigned char *__restrict in, unsigned n, unsigned       *__restrict out, unsigned start);