diff --git a/pom.xml b/pom.xml
index c5af523..170a9e4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -139,6 +139,12 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-mailer</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>net.sf.jmimemagic</groupId>
+            <artifactId>jmimemagic</artifactId>
+            <version>0.1.5</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>
diff --git a/src/main/java/fr/titionfire/ffsaf/utils/Utils.java b/src/main/java/fr/titionfire/ffsaf/utils/Utils.java
index b1a700c..59728dc 100644
--- a/src/main/java/fr/titionfire/ffsaf/utils/Utils.java
+++ b/src/main/java/fr/titionfire/ffsaf/utils/Utils.java
@@ -5,6 +5,10 @@ import jakarta.ws.rs.core.HttpHeaders;
 import jakarta.ws.rs.core.MediaType;
 import jakarta.ws.rs.core.Response;
 import jodd.net.MimeTypes;
+import net.sf.jmimemagic.Magic;
+import net.sf.jmimemagic.MagicException;
+import net.sf.jmimemagic.MagicMatchNotFoundException;
+import net.sf.jmimemagic.MagicParseException;
 import org.jboss.logging.Logger;
 
 import java.io.*;
@@ -76,7 +80,12 @@ public class Utils {
                 return "OK";
 
             try (InputStream is = new BufferedInputStream(new ByteArrayInputStream(input))) {
-                String mimeType = URLConnection.guessContentTypeFromStream(is);
+                String mimeType;
+                try {
+                    mimeType = Magic.getMagicMatch(input, false).getMimeType();
+                } catch (MagicParseException | MagicMatchNotFoundException | MagicException e) {
+                    mimeType = URLConnection.guessContentTypeFromStream(is);
+                }
                 String[] detectedExtensions = MimeTypes.findExtensionsByMimeTypes(mimeType, false);
                 if (detectedExtensions.length == 0)
                     throw new IOException("Fail to detect file extension for MIME type " + mimeType);