diff --git a/scene/resources/bit_map.cpp b/scene/resources/bit_map.cpp
index 653a4f4949d..53f97fefc9f 100644
--- a/scene/resources/bit_map.cpp
+++ b/scene/resources/bit_map.cpp
@@ -559,6 +559,7 @@ void BitMap::grow_mask(int p_pixels, const Rect2i &p_rect) {
 
 	bool bit_value = p_pixels > 0;
 	p_pixels = Math::abs(p_pixels);
+	const int pixels2 = p_pixels * p_pixels;
 
 	Rect2i r = Rect2i(0, 0, width, height).intersection(p_rect);
 
@@ -588,8 +589,8 @@ void BitMap::grow_mask(int p_pixels, const Rect2i &p_rect) {
 						}
 					}
 
-					float d = Point2(j, i).distance_to(Point2(x, y)) - CMP_EPSILON;
-					if (d > p_pixels) {
+					float d = Point2(j, i).distance_squared_to(Point2(x, y)) - CMP_EPSILON2;
+					if (d > pixels2) {
 						continue;
 					}