diff --git a/src/lib.rs b/src/lib.rs
index 1f9214d..c127ada 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -118,7 +118,7 @@ impl ImGui {
    }
    pub fn mouse_pos(&self) -> (f32, f32) {
       let io: &mut ffi::ImGuiIO = unsafe { mem::transmute(ffi::igGetIO()) };
-      (io.mouse_pos.x as f32, io.mouse_pos.y as f32)
+      (io.mouse_pos.x, io.mouse_pos.y)
    }
    pub fn set_mouse_pos(&mut self, x: f32, y: f32) {
       let io: &mut ffi::ImGuiIO = unsafe { mem::transmute(ffi::igGetIO()) };
@@ -129,8 +129,8 @@ impl ImGui {
       let io: &mut ffi::ImGuiIO = unsafe { mem::transmute(ffi::igGetIO()) };
       io.mouse_down = *states;
    }
-   pub fn get_time(&self) -> f32 { unsafe { ffi::igGetTime() as f32 } }
-   pub fn get_frame_count(&self) -> i32 { unsafe { ffi::igGetFrameCount() as i32 } }
+   pub fn get_time(&self) -> f32 { unsafe { ffi::igGetTime() } }
+   pub fn get_frame_count(&self) -> i32 { unsafe { ffi::igGetFrameCount() } }
    pub fn frame<'fr, 'a: 'fr>(&'a mut self, width: u32, height: u32, delta_time: f32) -> Frame<'fr> {
       unsafe {
          let io: &mut ffi::ImGuiIO = mem::transmute(ffi::igGetIO());
@@ -234,12 +234,12 @@ impl<'fr> Frame<'fr> {
    pub fn separator(&self) { unsafe { ffi::igSeparator() }; }
    pub fn same_line(&self, pos_x: f32) {
       unsafe {
-         ffi::igSameLine(pos_x as c_float, -1.0f32 as c_float)
+         ffi::igSameLine(pos_x, -1.0f32)
       }
    }
    pub fn same_line_spacing(&self, pos_x: f32, spacing_w: f32) {
       unsafe {
-         ffi::igSameLine(pos_x as c_float, spacing_w as c_float)
+         ffi::igSameLine(pos_x, spacing_w)
       }
    }
    pub fn spacing(&self) { unsafe { ffi::igSpacing() }; }
diff --git a/src/sliders.rs b/src/sliders.rs
index 23dedba..385d694 100644
--- a/src/sliders.rs
+++ b/src/sliders.rs
@@ -34,16 +34,15 @@ impl<'fr, 'p> SliderInt<'fr, 'p> {
       }
    }
    pub fn build(self) -> Option<i32> {
-      let mut value = self.value as c_int;
+      let mut value = self.value;
       let changed = unsafe {
          ffi::igSliderInt(self.label.as_ptr(),
             &mut value,
-            self.min as c_int,
-            self.max as c_int,
+            self.min, self.max,
             self.display_format.as_ptr()
          )
       };
-      if changed { Some(value as i32) } else { None }
+      if changed { Some(value) } else { None }
    }
 }
 
@@ -84,17 +83,16 @@ impl<'fr, 'p> SliderFloat<'fr, 'p> {
       }
    }
    pub fn build(self) -> Option<f32> {
-      let mut value = self.value as c_float;
+      let mut value = self.value;
       let changed = unsafe {
          ffi::igSliderFloat(self.label.as_ptr(),
             &mut value,
-            self.min as c_float,
-            self.max as c_float,
+            self.min, self.max,
             self.display_format.as_ptr(),
-            self.power as c_float
+            self.power
          )
       };
-      if changed { Some(value as f32) } else { None }
+      if changed { Some(value) } else { None }
    }
 }
 
diff --git a/src/window.rs b/src/window.rs
index 8afbc09..87f3563 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -171,7 +171,7 @@ impl<'fr, 'p> Window<'fr, 'p> {
          }
          ffi::igBegin2(self.name.as_ptr(),
             if self.closable { &mut opened } else { ptr::null_mut() },
-            ImVec2::new(0.0, 0.0), self.bg_alpha as c_float, self.flags
+            ImVec2::new(0.0, 0.0), self.bg_alpha, self.flags
          )
       };
       if render {