diff --git a/bin/configs/crystal.yaml b/bin/configs/crystal.yaml
index db88d8bfd9b5..76cdfcd88ac6 100644
--- a/bin/configs/crystal.yaml
+++ b/bin/configs/crystal.yaml
@@ -6,6 +6,7 @@ additionalProperties:
   shardVersion: 1.0.0
   moduleName: Petstore
   shardName: petstore
+  #paramsEncoder: Crest::EnumeratedFlatParamsEncoder
 strictSpecBehavior: false
 modelNameMappings:
   PropertyNameMapping: AnotherPropertyNameMapping
diff --git a/docs/generators/crystal.md b/docs/generators/crystal.md
index b9d588123329..ba481b67e4da 100644
--- a/docs/generators/crystal.md
+++ b/docs/generators/crystal.md
@@ -25,6 +25,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |hideGenerationTimestamp|Hides the generation timestamp when files are generated.| |true|
 |legacyDiscriminatorBehavior|Set to false for generators with better support for discriminators. (Python, Java, Go, PowerShell, C# have this enabled by default).|<dl><dt>**true**</dt><dd>The mapping in the discriminator includes descendent schemas that allOf inherit from self and the discriminator mapping schemas in the OAS document.</dd><dt>**false**</dt><dd>The mapping in the discriminator includes any descendent schemas that allOf inherit from self, any oneOf schemas, any anyOf schemas, any x-discriminator-values, and the discriminator mapping schemas in the OAS document AND Codegen validates that oneOf and anyOf schemas contain the required discriminator and throws an error if the discriminator is missing.</dd></dl>|true|
 |moduleName|module name (e.g. TwitterClient| |OpenAPIClient|
+|paramsEncoder|params_encoder setting (e.g. Crest::NestedParamsEncoder, Crest::EnumeratedFlatParamsEncoder, Crest::ZeroEnumeratedFlatParamsEncoder| |Crest::NestedParamsEncoder|
 |prependFormOrBodyParameters|Add form or body parameters to the beginning of the parameter list.| |false|
 |shardAuthor|shard author (only one is supported).| |null|
 |shardAuthorEmail|shard author email (only one is supported).| |null|
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CrystalClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CrystalClientCodegen.java
index 63ee468003ba..42ed65816e85 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CrystalClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CrystalClientCodegen.java
@@ -57,6 +57,7 @@ public class CrystalClientCodegen extends DefaultCodegen {
     @Setter protected String shardDescription = "This shard maps to a REST API";
     @Setter protected String shardAuthor = "";
     @Setter protected String shardAuthorEmail = "";
+    @Setter protected String paramsEncoder = "Crest::NestedParamsEncoder";
     protected String apiDocPath = "docs/";
     protected String modelDocPath = "docs/";
     protected List<String> primitiveTypes = new ArrayList<String>();
@@ -70,6 +71,7 @@ public class CrystalClientCodegen extends DefaultCodegen {
     public static final String SHARD_DESCRIPTION = "shardDescription";
     public static final String SHARD_AUTHOR = "shardAuthor";
     public static final String SHARD_AUTHOR_EMAIL = "shardAuthorEmail";
+    public static final String PARAMS_ENCODER = "paramsEncoder";
 
     public CrystalClientCodegen() {
         super();
@@ -197,8 +199,7 @@ public CrystalClientCodegen() {
 
         cliOptions.add(new CliOption(SHARD_HOMEPAGE, "shard homepage.").defaultValue("http://org.openapitools"));
 
-        cliOptions.add(
-                new CliOption(SHARD_DESCRIPTION, "shard description.").defaultValue("This shard maps to a REST API"));
+        cliOptions.add(new CliOption(SHARD_DESCRIPTION, "shard description.").defaultValue("This shard maps to a REST API"));
 
         cliOptions.add(new CliOption(SHARD_AUTHOR, "shard author (only one is supported)."));
 
@@ -206,6 +207,10 @@ public CrystalClientCodegen() {
 
         cliOptions.add(new CliOption(CodegenConstants.HIDE_GENERATION_TIMESTAMP,
                 CodegenConstants.HIDE_GENERATION_TIMESTAMP_DESC).defaultValue(Boolean.TRUE.toString()));
+
+        cliOptions.add(new CliOption(PARAMS_ENCODER,
+                "params_encoder setting (e.g. Crest::NestedParamsEncoder, Crest::EnumeratedFlatParamsEncoder, Crest::ZeroEnumeratedFlatParamsEncoder").
+                defaultValue("Crest::NestedParamsEncoder"));
     }
 
     @Override
@@ -260,6 +265,12 @@ public void processOpts() {
             setShardAuthorEmail((String) additionalProperties.get(SHARD_AUTHOR_EMAIL));
         }
 
+        if (additionalProperties.containsKey(PARAMS_ENCODER)) {
+            setParamsEncoder((String) additionalProperties.get(PARAMS_ENCODER));
+        } else {
+            additionalProperties.put(PARAMS_ENCODER, paramsEncoder);
+        }
+
         // make api and model doc path available in mustache template
         additionalProperties.put("apiDocPath", apiDocPath);
         additionalProperties.put("modelDocPath", modelDocPath);
diff --git a/modules/openapi-generator/src/main/resources/crystal/api_client.mustache b/modules/openapi-generator/src/main/resources/crystal/api_client.mustache
index dcfecda0b783..3eff533c447a 100644
--- a/modules/openapi-generator/src/main/resources/crystal/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/crystal/api_client.mustache
@@ -147,7 +147,7 @@ module {{moduleName}}
         form: form_or_body,
         logging: @config.debugging,
         handle_errors: false,
-        params_encoder: Crest::NestedParamsEncoder
+        params_encoder: {{{paramsEncoder}}}
       )
 
       response = request.execute