diff --git a/redisson/src/main/java/org/redisson/config/ConfigSupport.java b/redisson/src/main/java/org/redisson/config/ConfigSupport.java
index 051531266..b1304e551 100644
--- a/redisson/src/main/java/org/redisson/config/ConfigSupport.java
+++ b/redisson/src/main/java/org/redisson/config/ConfigSupport.java
@@ -62,16 +62,6 @@ import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
  */
 public class ConfigSupport {
     
-    private final EnvProvider env;
-    
-    public ConfigSupport() {
-        this(new SystemEnvProvider());
-    }
-    
-    public ConfigSupport(EnvProvider env) {
-        this.env = env;
-    }
-    
     @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "class")
     @JsonFilter("classFilter")
     public static class ClassMixIn {
@@ -150,7 +140,7 @@ public class ConfigSupport {
         Matcher m = pattern.matcher(content);
         while (m.find()) {
             String[] parts = m.group(1).split(":-");
-            String v = env.get(parts[0]);
+            String v = System.getenv(parts[0]);
             if (v != null) {
                 content = content.replace(m.group(), v);
             } else if (parts.length == 2) {
diff --git a/redisson/src/main/java/org/redisson/config/EnvProvider.java b/redisson/src/main/java/org/redisson/config/EnvProvider.java
deleted file mode 100644
index 493a7f030..000000000
--- a/redisson/src/main/java/org/redisson/config/EnvProvider.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package org.redisson.config;
-
-/**
- * Adaptor for key value storage, a.k.a. Environment.
- */
-@FunctionalInterface
-interface EnvProvider {
-    
-    /**
-     * Gets the value of the specified environment variable. An
-     * environment variable is a system-dependent external named
-     * value.
-     *
-     * @param name the name of the environment variable
-     * @return the string value of the variable, or <code>null</code>
-     * if the variable is not defined in the system environment
-     */
-    String get(String name);
-    
-}
diff --git a/redisson/src/main/java/org/redisson/config/SystemEnvProvider.java b/redisson/src/main/java/org/redisson/config/SystemEnvProvider.java
deleted file mode 100644
index 89364992a..000000000
--- a/redisson/src/main/java/org/redisson/config/SystemEnvProvider.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package org.redisson.config;
-
-/**
- * Default implementation for environment values adaptor.
- */
-public class SystemEnvProvider implements EnvProvider {
-    
-    /**
-     * @see System#getenv()
-     */
-    @Override
-    public String get(String name) {
-        return System.getenv(name);
-    }
-    
-}
diff --git a/redisson/src/test/java/org/redisson/config/ConfigSupportTest.java b/redisson/src/test/java/org/redisson/config/ConfigSupportTest.java
index 525e2b4b6..1a2aa8ac9 100644
--- a/redisson/src/test/java/org/redisson/config/ConfigSupportTest.java
+++ b/redisson/src/test/java/org/redisson/config/ConfigSupportTest.java
@@ -1,12 +1,12 @@
 package org.redisson.config;
 
 import com.fasterxml.jackson.databind.exc.InvalidFormatException;
+import mockit.Mock;
+import mockit.MockUp;
 import org.junit.Test;
 
 import java.io.IOException;
 import java.net.URI;
-import java.util.HashMap;
-import java.util.Map;
 
 import static org.junit.Assert.*;
 
@@ -14,46 +14,54 @@ public class ConfigSupportTest {
     
     @Test
     public void testParsingLiteral() throws IOException {
-        SingleServerConfig config = mkConfig("127.0.0.1", new HashMap<String, String>() {{
-            put("REDIS_URI", "1.1.1.1");
-        }});
+        mockHostEnv("1.1.1.1");
+        SingleServerConfig config = mkConfig("127.0.0.1");
         
         assertEquals(URI.create("redis://127.0.0.1"), config.getAddress());
     }
     
     @Test
     public void testParsingEnv() throws IOException {
-        SingleServerConfig config = mkConfig("${REDIS_URI}", new HashMap<String, String>() {{
-            put("REDIS_URI", "1.1.1.1");
-        }});
+        mockHostEnv("1.1.1.1");
+        SingleServerConfig config = mkConfig("${REDIS_URI}");
         
         assertEquals(URI.create("redis://1.1.1.1"), config.getAddress());
     }
     
     @Test(expected = InvalidFormatException.class)
     public void testParsingEnv_envMissing() throws IOException {
-        mkConfig("${REDIS_URI}", new HashMap<>());
+        mockHostEnv(null);
+        mkConfig("${REDIS_URI}");
     }
     
     @Test
     public void testParsingDefault_envPresent() throws IOException {
-        SingleServerConfig config = mkConfig("${REDIS_URI:-10.0.0.1}", new HashMap<String, String>() {{
-            put("REDIS_URI", "11.0.0.1");
-        }});
+        mockHostEnv("11.0.0.1");
+        SingleServerConfig config = mkConfig("${REDIS_URI:-10.0.0.1}");
         
         assertEquals(URI.create("redis://11.0.0.1"), config.getAddress());
     }
     
     @Test
     public void testParsingDefault_envMissing() throws IOException {
-        SingleServerConfig config = mkConfig("${REDIS_URI:-10.0.0.1}", new HashMap<>());
+        mockHostEnv(null);
+        SingleServerConfig config = mkConfig("${REDIS_URI:-10.0.0.1}");
         
         assertEquals(URI.create("redis://10.0.0.1"), config.getAddress());
     }
     
-    private SingleServerConfig mkConfig(String authorityValue, Map<String, String> env) throws IOException {
+    private SingleServerConfig mkConfig(String authorityValue) throws IOException {
         String config = "singleServerConfig:\n  address: redis://" + authorityValue;
-        return new ConfigSupport(env::get).fromYAML(config, Config.class).getSingleServerConfig();
+        return new ConfigSupport().fromYAML(config, Config.class).getSingleServerConfig();
+    }
+    
+    private void mockHostEnv(String value) {
+        new MockUp<System>() {
+            @Mock
+            String getenv(String name) {
+                return value;
+            }
+        };
     }
     
 }