diff --git a/src/vmath.nim b/src/vmath.nim
index 371d1d2..554f743 100644
--- a/src/vmath.nim
+++ b/src/vmath.nim
@@ -501,9 +501,9 @@ template genVecConstructor*(lower, upper, typ: untyped) =
   proc `lower 4`*[T](x: GVec4[T]): `upper 4` =
     gvec4[typ](typ(x[0]), typ(x[1]), typ(x[2]), typ(x[3]))
 
-  proc `lower 3`*[T](x: GVec2[T], z: T = 0): `upper 3` =
+  proc `lower 3`*[T](x: GVec2[T], z: T = 0.T): `upper 3` =
     gvec3[typ](typ(x[0]), typ(x[1]), z)
-  proc `lower 4`*[T](x: GVec3[T], w: T = 0): `upper 4` =
+  proc `lower 4`*[T](x: GVec3[T], w: T = 0.T): `upper 4` =
     gvec4[typ](typ(x[0]), typ(x[1]), typ(x[2]), w)
 
   proc `lower 4`*[T](a, b: GVec2[T]): `upper 4` =