diff --git a/tests/cv/src/afeatures2d.cpp b/tests/cv/src/afeatures2d.cpp
index 5fae037c3..4b36c4e9c 100644
--- a/tests/cv/src/afeatures2d.cpp
+++ b/tests/cv/src/afeatures2d.cpp
@@ -743,4 +743,4 @@ CV_CalonderDescriptorExtractorTest<float> floatCalonderTest( "descriptor-calonde
 CV_DescriptorMatcherTest bruteForceMatcherTest( "descriptor-matcher-brute-force",
                                                 new BruteForceMatcher<L2<float> >, 0.01 );
 CV_DescriptorMatcherTest flannBasedMatcherTest( "descriptor-matcher-flann-based",
-                                                new FlannBasedMatcher, 0.02 );
+                                                new FlannBasedMatcher, 0.04 );
diff --git a/tests/cv/src/tsysa.cpp b/tests/cv/src/tsysa.cpp
index 6c696cece..b2a38fcb8 100644
--- a/tests/cv/src/tsysa.cpp
+++ b/tests/cv/src/tsysa.cpp
@@ -77,7 +77,7 @@ const char* blacklist[] =
     "warp-resize",                    //ticket 429
     "warp-undistort",                 //ticket 577
 
-    "descriptor-matcher-flann-based", //ticket 637
+    //"descriptor-matcher-flann-based", //ticket 637
     0
 };