diff --git a/artiq/py2llvm/fractions.py b/artiq/py2llvm/fractions.py
index 1c97369b8..e57d12a52 100644
--- a/artiq/py2llvm/fractions.py
+++ b/artiq/py2llvm/fractions.py
@@ -171,7 +171,7 @@ class VFraction(VGeneric):
         r = VFraction()
         if builder is not None:
             if isinstance(other, VInt):
-                i = other.o_int64(builder).auto_load()
+                i = other.o_int64(builder).auto_load(builder)
                 x, rd = self._nd(builder)
                 y = builder.mul(rd, i)
             else: