diff --git a/constantine/math/elliptic/ec_scalar_mul_vartime.nim b/constantine/math/elliptic/ec_scalar_mul_vartime.nim
index 89357975..438b403d 100644
--- a/constantine/math/elliptic/ec_scalar_mul_vartime.nim
+++ b/constantine/math/elliptic/ec_scalar_mul_vartime.nim
@@ -81,7 +81,7 @@ func scalarMul_addchain_4bit_vartime[EC](P: var EC, scalar: BigInt) {.tags:[VarT
   of 5:
     var t {.noInit.}: EC
     t.double(P)
-    t.double(P)
+    t.double()
     P ~+= t
   of 6:
     var t {.noInit.}: EC