diff --git a/backend.native/tests/build.gradle b/backend.native/tests/build.gradle
index 55ac6d3d892..807c325f3ba 100644
--- a/backend.native/tests/build.gradle
+++ b/backend.native/tests/build.gradle
@@ -380,7 +380,7 @@ task tostring0(type: RunKonanTest) {
         // To be investigated.
         disabled = true
     }
-    goldValue = "127\n-1\n239\nA\nЁ\nト\n1122334455\n112233445566778899\n3.14159\n1E+27\n1E-300\ntrue\nfalse\n"
+    goldValue = "127\n-1\n239\nA\nЁ\nト\n1122334455\n112233445566778899\n3.14159265358\n1.0E27\n1.0E-300\ntrue\nfalse\n"
     source = "runtime/basic/tostring0.kt"
 }
 
@@ -401,11 +401,10 @@ task tostring3(type: RunKonanTest) {
     }
     goldValue = "-128\n127\n-32768\n32767\n" +
             "-2147483648\n2147483647\n-9223372036854775808\n9223372036854775807\n" +
-            "1.4013E-45\n3.40282E+38\n-INF\nINF\n" +
-            // Linux version prints -NAN.
-            // "NAN\n" +
-            "4.94066E-324\n1.79769E+308\n-INF\nINF\n"
-            // "NAN\n"
+            "1.4E-45\n3.4028235E38\n-Infinity\nInfinity\n" +
+            "NaN\n" +
+            "4.9E-324\n1.7976931348623157E308\n-Infinity\nInfinity\n" +
+            "NaN\n"
     source = "runtime/basic/tostring3.kt"
 }
 
@@ -1774,7 +1773,7 @@ task deserialized_members(type: LinkKonanTest) {
         "inner third level\n"+
         "types first level: 13\n"+
         "types second level cha-cha-cha\n"+
-        "types third level 1\n"
+        "types third level 1.0\n"
     lib = "serialization/serialize_members.kt"
     source = "serialization/deserialize_members.kt"
 }
diff --git a/backend.native/tests/runtime/basic/tostring3.kt b/backend.native/tests/runtime/basic/tostring3.kt
index 23c7844dcec..771fa6b32bb 100644
--- a/backend.native/tests/runtime/basic/tostring3.kt
+++ b/backend.native/tests/runtime/basic/tostring3.kt
@@ -35,24 +35,24 @@ fun testLong() {
 }
 
 fun testFloat() {
-    val values = FloatArray(4)
+    val values = FloatArray(5)
     values[0] = Float.MIN_VALUE
     values[1] = Float.MAX_VALUE
     values[2] = Float.NEGATIVE_INFINITY
     values[3] = Float.POSITIVE_INFINITY
-    //values[4] = Float.NaN
+    values[4] = Float.NaN
     for (v in values) {
         println(v)
     }
 }
 
 fun testDouble() {
-    val values = DoubleArray(4)
+    val values = DoubleArray(5)
     values[0] = Double.MIN_VALUE
     values[1] = Double.MAX_VALUE
     values[2] = Double.NEGATIVE_INFINITY
     values[3] = Double.POSITIVE_INFINITY
-    //values[4] = Double.NaN
+    values[4] = Double.NaN
     for (v in values) {
         println(v)
     }