diff --git a/modules/features2d/src/fast.cpp b/modules/features2d/src/fast.cpp
index bd39898b32..03147cc313 100644
--- a/modules/features2d/src/fast.cpp
+++ b/modules/features2d/src/fast.cpp
@@ -174,8 +174,20 @@ void FAST_t(InputArray _img, std::vector<KeyPoint>& keypoints, int threshold, bo
                                     if(nonmax_suppression)
                                     {
                                         short d[25];
-                                        for (int _k = 0; _k < 25; _k++)
+                                        int _k = 0;
+                                    #if CV_ENABLE_UNROLLED
+                                        for (; _k + 4 < 25; _k += 5)
+                                        {
+                                            d[_k]     = (short)(ptr[k] - ptr[k + pixel[_k]]);
+                                            d[_k + 1] = (short)(ptr[k] - ptr[k + pixel[_k + 1]]);
+                                            d[_k + 2] = (short)(ptr[k] - ptr[k + pixel[_k + 2]]);
+                                            d[_k + 3] = (short)(ptr[k] - ptr[k + pixel[_k + 3]]);
+                                            d[_k + 4] = (short)(ptr[k] - ptr[k + pixel[_k + 4]]);
+                                        }
+                                    #else
+                                        for ( ; _k < 25; _k++)
                                             d[_k] = (short)(ptr[k] - ptr[k + pixel[_k]]);
+                                    #endif
 
                                         v_int16x8 a0, b0, a1, b1;
                                         a0 = b0 = a1 = b1 = v_load(d + 8);