diff --git a/src/core/model/int64x64-cairo.h b/src/core/model/int64x64-cairo.h
index 00b32dbe4..b96e3b743 100644
--- a/src/core/model/int64x64-cairo.h
+++ b/src/core/model/int64x64-cairo.h
@@ -26,7 +26,7 @@ public:
   {
 #define HPCAIRO_MAX_64 18446744073709551615.0
     double fhi = std::floor (value);
-    int64_t hi = std::lround (fhi);
+    int64_t hi = lround (fhi);
     uint64_t lo = (uint64_t)((value - fhi) * HPCAIRO_MAX_64);
     _v.hi = hi;
     _v.lo = lo;