diff --git a/ext/gd/libgd/gd_interpolation.c b/ext/gd/libgd/gd_interpolation.c
index 1c151b55090..4446ec772be 100644
--- a/ext/gd/libgd/gd_interpolation.c
+++ b/ext/gd/libgd/gd_interpolation.c
@@ -1783,8 +1783,8 @@ gdImagePtr gdImageRotateGeneric(gdImagePtr src, const float degrees, const int b
 
 	const gdFixed f_slop_y = f_sin;
 	const gdFixed f_slop_x = f_cos;
-	const gdFixed f_slop = f_slop_x > 0 && f_slop_x > 0 ?
-							f_slop_x > f_slop_y ? gd_divfx(f_slop_y, f_slop_x) : gd_divfx(f_slop_x, f_slop_y)
+	const gdFixed f_slop = f_slop_x > 0 && f_slop_y > 0 ?
+							(f_slop_x > f_slop_y ? gd_divfx(f_slop_y, f_slop_x) : gd_divfx(f_slop_x, f_slop_y))
 						: 0;