1 files changed, 1 insertions, 0 deletions

diff --git a/src/arch/common.h b/src/arch/common.h
index 2a83fbf..a7c4a3b 100644
--- a/src/arch/common.h
+++ b/src/arch/common.h
@@ -13,6 +13,7 @@
 #define EFLIP       UINT8_C(0x10)
 
 STATIC_INLINE int popcount_u32(uint32_t);
+STATIC_INLINE int popcount_u64(uint64_t);
 
 STATIC void pieces(cube_t [NON_NULL], uint8_t [SIZE(8)], uint8_t [SIZE(12)]);
 STATIC_INLINE bool equal(cube_t, cube_t);