diff --git a/spec/std/complex_spec.cr b/spec/std/complex_spec.cr
index 0524f912aa6d..fe0f1ac628ac 100644
--- a/spec/std/complex_spec.cr
+++ b/spec/std/complex_spec.cr
@@ -17,9 +17,8 @@ end
 describe "Complex" do
   describe "as numbers" do
     it_can_convert_between([Complex], [Complex])
-    it_can_convert_between({{BUILTIN_NUMBER_TYPES_LTE_64}}, [Complex])
-    it_can_convert_between([Complex], {{BUILTIN_NUMBER_TYPES_LTE_64}})
-    # TODO pending conversion between Int128
+    it_can_convert_between({{BUILTIN_NUMBER_TYPES}}, [Complex])
+    it_can_convert_between([Complex], {{BUILTIN_NUMBER_TYPES}})
 
     division_between_returns {{BUILTIN_NUMBER_TYPES}}, [Complex], Complex
     division_between_returns [Complex], {{BUILTIN_NUMBER_TYPES}}, Complex
diff --git a/src/complex.cr b/src/complex.cr
index d4e648e9c8fe..bbe7eb54e921 100644
--- a/src/complex.cr
+++ b/src/complex.cr
@@ -59,32 +59,14 @@ struct Complex
     @real
   end
 
-  # Returns the value as a `Float32` if possible (the imaginary part should be exactly zero),
-  # raises otherwise.
-  def to_f32 : Float32
-    to_f64.to_f32
-  end
-
   # See `#to_f64`.
   def to_f
     to_f64
   end
 
-  # Returns the value as an `Int64` if possible (the imaginary part should be exactly zero),
-  # raises otherwise.
-  def to_i64 : Int64
-    to_f64.to_i64
-  end
-
-  delegate to_i32, to_i16, to_i8, to: to_i64
-
-  # Returns the value as an `UInt64` if possible (the imaginary part should be exactly zero),
-  # raises otherwise.
-  def to_u64 : UInt64
-    to_f64.to_u64
-  end
-
-  delegate to_u32, to_u16, to_u8, to: to_u64
+  delegate to_i128, to_i64, to_i32, to_i16, to_i8, to: to_f64
+  delegate to_u128, to_u64, to_u32, to_u16, to_u8, to: to_f64
+  delegate to_f32, to: to_f64
 
   # See `#to_i32`.
   def to_i