diff --git a/pom.xml b/pom.xml
index d7af862..a0a25ab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -127,8 +127,8 @@
         </dependency>
         <dependency>
             <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-core</artifactId>
-            <version>1.3</version>
+            <artifactId>hamcrest-junit</artifactId>
+            <version>2.0.0.0</version>
             <scope>test</scope>
         </dependency>
 
diff --git a/src/main/java/si/mazi/rescu/Params.java b/src/main/java/si/mazi/rescu/Params.java
index cb11518..481ab6d 100644
--- a/src/main/java/si/mazi/rescu/Params.java
+++ b/src/main/java/si/mazi/rescu/Params.java
@@ -25,6 +25,7 @@
 import java.io.UnsupportedEncodingException;
 import java.math.BigDecimal;
 import java.net.URLEncoder;
+import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.regex.Matcher;
@@ -86,12 +87,21 @@ public Params add(String param, Object value) {
 
     private String toQueryString(boolean encode) {
         StringBuilder b = new StringBuilder();
-        for (String param : data.keySet()) {
-            if (isParamSet(param)) {
-                if (b.length() > 0) {
-                    b.append('&');
+        for (String paramName : data.keySet()) {
+            if (isParamSet(paramName)) {
+                Object originalValue = getParamValue(paramName);
+                boolean createArrayParameters = originalValue instanceof Iterable && paramName.endsWith("[]");
+                @SuppressWarnings("unchecked")
+                Iterable<Object> paramValues = createArrayParameters
+                        ? (Iterable<Object>)originalValue
+                        : Collections.singleton(originalValue);
+                for (Object paramValue : paramValues) {
+                    if (b.length() > 0) {
+                        b.append('&');
+                    }
+                    String paramValueAsString = toString(paramValue);
+                    b.append(paramName).append('=').append(encode(paramValueAsString, encode));
                 }
-                b.append(param).append('=').append(encode(getParamValueAsString(param), encode));
             }
         }
         return b.toString();
@@ -147,12 +157,12 @@ static String toString(Object paramValue) {
         if (paramValue instanceof BigDecimal) {
             return ((BigDecimal) paramValue).toPlainString();
         } else if (paramValue instanceof Iterable) {
-            return collectionToString((Iterable) paramValue);
+            return iterableToString((Iterable) paramValue);
         }
         return paramValue.toString();
     }
 
-    static String collectionToString(Iterable iterable) {
+    static String iterableToString(Iterable iterable) {
         final StringBuilder sb = new StringBuilder();
         for (Object o : iterable) {
             if (sb.length() > 0) {
diff --git a/src/test/java/si/mazi/rescu/ExampleService.java b/src/test/java/si/mazi/rescu/ExampleService.java
index c4d5227..a864091 100644
--- a/src/test/java/si/mazi/rescu/ExampleService.java
+++ b/src/test/java/si/mazi/rescu/ExampleService.java
@@ -30,6 +30,7 @@
 import javax.ws.rs.core.MediaType;
 import java.io.IOException;
 import java.math.BigDecimal;
+import java.util.List;
 
 /**
  * @author Matija Mazi
@@ -127,4 +128,13 @@ public interface ExampleService {
     @Consumes(MediaType.APPLICATION_JSON)
     DummyTicker testGetMethodWithBody(DummyAccountInfo ticker) throws IOException;
 
+    @POST
+    @Path("formPostCollection")
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    Object testFromPostCollection(@FormParam("data") List<String> data);
+
+    @POST
+    @Path("formPostCollection")
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    Object testFromPostCollectionAsArray(@FormParam("data[]") List<String> data);
 }
diff --git a/src/test/java/si/mazi/rescu/RestInvocationTest.java b/src/test/java/si/mazi/rescu/RestInvocationTest.java
index 54775ac..4481a1d 100644
--- a/src/test/java/si/mazi/rescu/RestInvocationTest.java
+++ b/src/test/java/si/mazi/rescu/RestInvocationTest.java
@@ -30,9 +30,13 @@
 import javax.ws.rs.HeaderParam;
 import javax.ws.rs.core.MediaType;
 import java.lang.annotation.Annotation;
+import java.net.URLDecoder;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
 
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.testng.Assert.assertEquals;
 
 /**
@@ -88,4 +92,28 @@ public void testCreateWithValueGenerator() {
         assertEquals(invocation.getParamValue(FormParam.class, "nonce"), nonce);
     }
 
+    @Test
+    public void testFormPostCollectionDefault() throws Exception {
+        TestRestInvocationHandler testHandler = new TestRestInvocationHandler(ExampleService.class, new ClientConfig(), null, 200);
+        ExampleService proxy = RestProxyFactory.createProxy(ExampleService.class, testHandler);
+
+        proxy.testFromPostCollection(Arrays.asList("first", "second"));
+
+        final String requestBody = URLDecoder.decode(testHandler.getInvocation().getRequestBody(), "UTF-8");
+        assertThat(requestBody, containsString("data=first,second"));
+    }
+
+    @Test
+    public void testFormPostCollectionArray() throws Exception {
+        ClientConfig config = new ClientConfig();
+
+        TestRestInvocationHandler testHandler = new TestRestInvocationHandler(ExampleService.class, config, null, 200);
+        ExampleService proxy = RestProxyFactory.createProxy(ExampleService.class, testHandler);
+
+        proxy.testFromPostCollectionAsArray(Arrays.asList("first", "second"));
+
+        final String requestBody = testHandler.getInvocation().getRequestBody();
+        assertThat(requestBody, containsString("data[]=first"));
+        assertThat(requestBody, containsString("data[]=second"));
+    }
 }