diff --git a/src/main/java/dev/vality/adapter/common/mapper/ErrorMapping.java b/src/main/java/dev/vality/adapter/common/mapper/ErrorMapping.java
index cbb7b20..fe0e758 100644
--- a/src/main/java/dev/vality/adapter/common/mapper/ErrorMapping.java
+++ b/src/main/java/dev/vality/adapter/common/mapper/ErrorMapping.java
@@ -13,13 +13,16 @@ import dev.vality.woody.api.flow.error.*;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.util.List;
-import java.util.Objects;
-import java.util.Optional;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetEncoder;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
 
 public class ErrorMapping {
 
     private static final String DEFAULT_PATTERN_REASON = "'%s' - '%s'";
+    private static final String DEFAULT_BASE64_PREFIX = "base64:";
+    private static final CharsetEncoder ASCII_ENCODER = StandardCharsets.US_ASCII.newEncoder();
 
     /**
      * Pattern for reason failure
@@ -137,7 +140,26 @@ public class ErrorMapping {
                 code, description, state);
         var errorDefinition = new WErrorDefinition(WErrorSource.INTERNAL);
         errorDefinition.setErrorType(WErrorType.UNEXPECTED_ERROR);
-        errorDefinition.setErrorReason(String.format("code = %s, description = %s", code, description));
+        errorDefinition.setErrorReason(String.format("code = %s, description = %s",
+                makeCompatibleWithHttpHeader(code),
+                makeCompatibleWithHttpHeader(description)));
         return new WRuntimeException(errorMessage, errorDefinition);
     }
+
+    private String makeCompatibleWithHttpHeader(String text) {
+        if (text == null || !containsNonAsciiSymbols(text)) {
+            return text;
+        }
+        return DEFAULT_BASE64_PREFIX +
+                Base64.getEncoder().withoutPadding().encodeToString(text.getBytes(StandardCharsets.UTF_8));
+    }
+
+    private boolean containsNonAsciiSymbols(String text) {
+        for (char c : text.toCharArray()) {
+            if (!ASCII_ENCODER.canEncode(c)) {
+                return true;
+            }
+        }
+        return false;
+    }
 }
diff --git a/src/test/java/dev/vality/adapter/common/mapper/ErrorMappingTest.java b/src/test/java/dev/vality/adapter/common/mapper/ErrorMappingTest.java
index b64af64..6d75370 100644
--- a/src/test/java/dev/vality/adapter/common/mapper/ErrorMappingTest.java
+++ b/src/test/java/dev/vality/adapter/common/mapper/ErrorMappingTest.java
@@ -33,6 +33,13 @@ public class ErrorMappingTest {
                 errorMappingFull.mapFailure("00001").toString());
     }
 
+    @Test
+    public void nonAsciiTest() {
+        var errorMappingFull = new ErrorMapping("'%s' - '%s'", List.of());
+        var exception = assertThrows(WRuntimeException.class, () -> errorMappingFull.mapFailure("ы"));
+        assertEquals("code = base64:0Ys, description = null", exception.getErrorDefinition().getErrorReason());
+    }
+
     @Test
     public void testNullDesc() {
         Error error = new Error();