diff --git a/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/definition/builder/MapTypeBuilder.java b/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/definition/builder/MapTypeBuilder.java
index f146731ba4..2aad5dfdaa 100755
--- a/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/definition/builder/MapTypeBuilder.java
+++ b/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/definition/builder/MapTypeBuilder.java
@@ -21,8 +21,6 @@ import org.apache.dubbo.metadata.definition.model.TypeDefinition;
 
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
-import java.text.MessageFormat;
-import java.util.Arrays;
 import java.util.Map;
 
 import static org.apache.dubbo.common.utils.TypeUtils.getRawClass;
@@ -52,12 +50,6 @@ public class MapTypeBuilder implements TypeBuilder {
         Type[] actualTypeArgs = parameterizedType.getActualTypeArguments();
         int actualTypeArgsLength = actualTypeArgs == null ? 0 : actualTypeArgs.length;
 
-        if (actualTypeArgsLength != 2) {
-            throw new IllegalArgumentException(MessageFormat.format(
-                    "[ServiceDefinitionBuilder] Map type [{0}] with unexpected amount of arguments [{1}]."
-                            + Arrays.toString(actualTypeArgs), type, actualTypeArgs));
-        }
-
         String mapType = type.toString();
 
         TypeDefinition typeDefinition = new TypeDefinition(mapType);