diff --git a/src/gu/pspgu.h b/src/gu/pspgu.h
index 35b274c6f6..01f7ba8fd0 100644
--- a/src/gu/pspgu.h
+++ b/src/gu/pspgu.h
@@ -1460,7 +1460,7 @@ void sceGuScissor(int x, int y, int w, int h);
   * @param width - Width of viewport
   * @param height - Height of viewport
 **/
-void sceGuViewport(int cx, int cy, int width, int height);
+void sceGuViewport(float cx, float cy, float width, float height);
 
 /**
   * Draw bezier surface
diff --git a/src/gu/sceGuViewport.c b/src/gu/sceGuViewport.c
index bb58292937..25f9d7a356 100644
--- a/src/gu/sceGuViewport.c
+++ b/src/gu/sceGuViewport.c
@@ -8,16 +8,14 @@
 
 #include "guInternal.h"
 
-void sceGuViewport(int cx, int cy, int width, int height)
+void sceGuViewport(float cx, float cy, float width, float height)
 {
-	float sx, sy, tx, ty;
-  	sx = (float)(width)  *  0.5f;
-	sy = (float)(height) * -0.5f;
-	tx = (float)cx;
-	ty = (float)cy;
+	float sx, sy;
+  	sx = width  *  0.5f;
+	sy = height * -0.5f;
 	
 	sendCommandf(VIEWPORT_X_SCALE, sx);
 	sendCommandf(VIEWPORT_Y_SCALE, sy);
-	sendCommandf(VIEWPORT_X_CENTER, tx);
-	sendCommandf(VIEWPORT_Y_CENTER, ty);
+	sendCommandf(VIEWPORT_X_CENTER, cx);
+	sendCommandf(VIEWPORT_Y_CENTER, cy);
 }