diff --git a/pom.xml b/pom.xml
index 6328a7e..ee71dc5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>io.dropwizard</groupId>
     <artifactId>dropwizard-maxmind</artifactId>
-    <version>1.0.5-1</version>
+    <version>1.0.5-2</version>
     <packaging>jar</packaging>
 
     <name>dropwizard-maxmind</name>
diff --git a/src/main/java/io/dropwizard/maxmind/geoip2/Characters.java b/src/main/java/io/dropwizard/maxmind/geoip2/Characters.java
new file mode 100644
index 0000000..d7c1923
--- /dev/null
+++ b/src/main/java/io/dropwizard/maxmind/geoip2/Characters.java
@@ -0,0 +1,12 @@
+package io.dropwizard.maxmind.geoip2;
+
+public class Characters {
+
+    public static String toAscii(String s) {
+        if (s == null || s.isEmpty()) {
+            return s;
+        }
+        return s.replaceAll("[^\\x20-\\x7e]", "");
+    }
+
+}
diff --git a/src/main/java/io/dropwizard/maxmind/geoip2/filter/MaxMindGeoIpRequestFilter.java b/src/main/java/io/dropwizard/maxmind/geoip2/filter/MaxMindGeoIpRequestFilter.java
index 286827a..56f7aab 100644
--- a/src/main/java/io/dropwizard/maxmind/geoip2/filter/MaxMindGeoIpRequestFilter.java
+++ b/src/main/java/io/dropwizard/maxmind/geoip2/filter/MaxMindGeoIpRequestFilter.java
@@ -28,6 +28,7 @@
 import com.maxmind.geoip2.model.CountryResponse;
 import com.maxmind.geoip2.model.EnterpriseResponse;
 import com.maxmind.geoip2.record.*;
+import io.dropwizard.maxmind.geoip2.Characters;
 import io.dropwizard.maxmind.geoip2.config.MaxMindConfig;
 import io.dropwizard.maxmind.geoip2.core.MaxMindHeaders;
 import lombok.extern.slf4j.Slf4j;
@@ -175,26 +176,32 @@ public void filter(final ContainerRequestContext containerRequestContext) throws
 
     private void addCountryInfo(Country country, final ContainerRequestContext containerRequestContext) {
         if (!Strings.isNullOrEmpty(country.getName()))
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_COUNTRY, country.getName());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_COUNTRY,
+                    Characters.toAscii(country.getName()));
         if (!Strings.isNullOrEmpty(country.getIsoCode()))
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_COUNTRY_ISO, country.getIsoCode());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_COUNTRY_ISO,
+                    Characters.toAscii(country.getIsoCode()));
     }
 
     private void addStateInfo(Subdivision subdivision, final ContainerRequestContext containerRequestContext) {
         if (!Strings.isNullOrEmpty(subdivision.getName()))
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_STATE, subdivision.getName());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_STATE,
+                    Characters.toAscii(subdivision.getName()));
         if (!Strings.isNullOrEmpty(subdivision.getIsoCode()))
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_STATE_ISO, subdivision.getIsoCode());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_STATE_ISO,
+                    Characters.toAscii(subdivision.getIsoCode()));
     }
 
     private void addCityInfo(City city, final ContainerRequestContext containerRequestContext) {
         if (!Strings.isNullOrEmpty(city.getName()))
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_CITY, city.getName());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_CITY,
+                    Characters.toAscii(city.getName()));
     }
 
     private void addPostalInfo(Postal postal, final ContainerRequestContext containerRequestContext) {
         if (!Strings.isNullOrEmpty(postal.getCode()))
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_POSTAL, postal.getCode());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_POSTAL,
+                    Characters.toAscii(postal.getCode()));
     }
 
     private void addLocationInfo(Location location, final ContainerRequestContext containerRequestContext) {
@@ -208,11 +215,14 @@ private void addLocationInfo(Location location, final ContainerRequestContext co
 
     private void addTraitsInfo(Traits traits, final ContainerRequestContext containerRequestContext) {
         if (!Strings.isNullOrEmpty(traits.getUserType()))
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_USER_TYPE, traits.getUserType());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_USER_TYPE,
+                    Characters.toAscii(traits.getUserType()));
         if (!Strings.isNullOrEmpty(traits.getIsp()))
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_ISP, traits.getIsp());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_ISP,
+                    Characters.toAscii(traits.getIsp()));
         if (traits.getConnectionType() != null)
-            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_CONNECTION_TYPE, traits.getConnectionType().name());
+            containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_CONNECTION_TYPE,
+                    Characters.toAscii(traits.getConnectionType().name()));
         containerRequestContext.getHeaders().putSingle(MaxMindHeaders.X_PROXY_LEGAL, String.valueOf(traits.isLegitimateProxy()));
     }
 
diff --git a/src/test/java/io/dropwizard/maxmind/geoip2/CharactersTest.java b/src/test/java/io/dropwizard/maxmind/geoip2/CharactersTest.java
new file mode 100644
index 0000000..7b473ca
--- /dev/null
+++ b/src/test/java/io/dropwizard/maxmind/geoip2/CharactersTest.java
@@ -0,0 +1,25 @@
+package io.dropwizard.maxmind.geoip2;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class CharactersTest {
+
+    @Test
+    public void testAsciiOnlyAsciiString(){
+        String s = "example abcd";
+        assertEquals(s, Characters.toAscii(s));
+    }
+
+    @Test
+    public void testAsciiNullString(){
+        assertEquals(null, Characters.toAscii(null));
+    }
+
+    @Test
+    public void testAsciiWithNonAsciiCharacters(){
+        assertEquals("orpsd", Characters.toAscii("orčpžsíáýd"));
+    }
+
+}
\ No newline at end of file