diff --git a/src/server/protocol.ts b/src/server/protocol.ts
index 2650cd5d765..d4ad6e7f0f1 100644
--- a/src/server/protocol.ts
+++ b/src/server/protocol.ts
@@ -94,6 +94,8 @@ namespace ts.server.protocol {
         ApplyChangedToOpenFiles = "applyChangedToOpenFiles",
         UpdateOpen = "updateOpen",
         /* @internal */
+        EncodedSyntacticClassificationsFull = "encodedSyntacticClassifications-full",
+        /* @internal */
         EncodedSemanticClassificationsFull = "encodedSemanticClassifications-full",
         /* @internal */
         Cleanup = "cleanup",
@@ -764,6 +766,29 @@ namespace ts.server.protocol {
         body?: string[];
     }
 
+    /**
+     * A request to get encoded Syntactic classifications for a span in the file
+     */
+    /** @internal */
+    export interface EncodedSyntacticClassificationsRequest extends FileRequest {
+        arguments: EncodedSyntacticClassificationsRequestArgs;
+    }
+
+    /**
+     * Arguments for EncodedSyntacticClassificationsRequest request.
+     */
+    /** @internal */
+    export interface EncodedSyntacticClassificationsRequestArgs extends FileRequestArgs {
+        /**
+         * Start position of the span.
+         */
+        start: number;
+        /**
+         * Length of the span.
+         */
+        length: number;
+    }
+
     /**
      * A request to get encoded semantic classifications for a span in the file
      */
@@ -775,6 +800,7 @@ namespace ts.server.protocol {
     /**
      * Arguments for EncodedSemanticClassificationsRequest request.
      */
+    /** @internal */
     export interface EncodedSemanticClassificationsRequestArgs extends FileRequestArgs {
         /**
          * Start position of the span.
diff --git a/src/server/session.ts b/src/server/session.ts
index 5064b529560..d663ca09249 100644
--- a/src/server/session.ts
+++ b/src/server/session.ts
@@ -881,6 +881,11 @@ namespace ts.server {
             }
         }
 
+        private getEncodedSyntacticClassifications(args: protocol.EncodedSyntacticClassificationsRequestArgs) {
+            const { file, languageService } = this.getFileAndLanguageServiceForSyntacticOperation(args);
+            return languageService.getEncodedSyntacticClassifications(file, args);
+        }
+
         private getEncodedSemanticClassifications(args: protocol.EncodedSemanticClassificationsRequestArgs) {
             const { file, project } = this.getFileAndProject(args);
             return project.getLanguageService().getEncodedSemanticClassifications(file, args);
@@ -2299,6 +2304,9 @@ namespace ts.server {
             [CommandNames.CompilerOptionsDiagnosticsFull]: (request: protocol.CompilerOptionsDiagnosticsRequest) => {
                 return this.requiredResponse(this.getCompilerOptionsDiagnostics(request.arguments));
             },
+            [CommandNames.EncodedSyntacticClassificationsFull]: (request: protocol.EncodedSyntacticClassificationsRequest) => {
+                return this.requiredResponse(this.getEncodedSyntacticClassifications(request.arguments));
+            },
             [CommandNames.EncodedSemanticClassificationsFull]: (request: protocol.EncodedSemanticClassificationsRequest) => {
                 return this.requiredResponse(this.getEncodedSemanticClassifications(request.arguments));
             },
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 82ab70b6e6f..505af006287 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -6415,19 +6415,6 @@ declare namespace ts.server.protocol {
          */
         body?: string[];
     }
-    /**
-     * Arguments for EncodedSemanticClassificationsRequest request.
-     */
-    interface EncodedSemanticClassificationsRequestArgs extends FileRequestArgs {
-        /**
-         * Start position of the span.
-         */
-        start: number;
-        /**
-         * Length of the span.
-         */
-        length: number;
-    }
     /**
      * Arguments in document highlight request; include: filesToSearch, file,
      * line, offset.
@@ -9076,6 +9063,7 @@ declare namespace ts.server {
         private updateErrorCheck;
         private cleanProjects;
         private cleanup;
+        private getEncodedSyntacticClassifications;
         private getEncodedSemanticClassifications;
         private getProject;
         private getConfigFileAndProject;