diff --git a/src/main/java/stirling/software/SPDF/controller/api/security/ValidateSignatureController.java b/src/main/java/stirling/software/SPDF/controller/api/security/ValidateSignatureController.java
index 4b4da4bdd..400bdf44a 100644
--- a/src/main/java/stirling/software/SPDF/controller/api/security/ValidateSignatureController.java
+++ b/src/main/java/stirling/software/SPDF/controller/api/security/ValidateSignatureController.java
@@ -22,6 +22,7 @@ import org.bouncycastle.cms.SignerInformationStore;
 import org.bouncycastle.cms.jcajce.JcaSimpleSignerInfoVerifierBuilder;
 import org.bouncycastle.util.Store;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -58,7 +59,7 @@ public class ValidateSignatureController {
             description =
                     "Validates the digital signatures in a PDF file against default or custom"
                             + " certificates. Input:PDF Output:JSON Type:SISO")
-    @PostMapping(value = "/validate-signature")
+    @PostMapping(value = "/validate-signature", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
     public ResponseEntity<List<SignatureValidationResult>> validateSignature(
             @ModelAttribute SignatureValidationRequest request) throws IOException {
         List<SignatureValidationResult> results = new ArrayList<>();