diff --git a/src/gl/renderer/gl_postprocess.cpp b/src/gl/renderer/gl_postprocess.cpp
index 6c18edd1e..ff65fee6d 100644
--- a/src/gl/renderer/gl_postprocess.cpp
+++ b/src/gl/renderer/gl_postprocess.cpp
@@ -569,7 +569,7 @@ void FGLRenderer::LensDistortScene()
 		0.0f
 	};
 
-	float aspect = mSceneViewport.width / mSceneViewport.height;
+	float aspect = mSceneViewport.width / (float)mSceneViewport.height;
 
 	// Scale factor to keep sampling within the input texture
 	float r2 = aspect * aspect * 0.25 + 0.25f;