diff --git a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
index 0f35f77..37beb05 100644
--- a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
+++ b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
@@ -73,9 +73,10 @@ static jobject build_profile_metadata(JNIEnv *env, struct es8p_metadata *metadat
             "Ljava/lang/String;" // serviceProviderName
             "Ljava/lang/String;" // profileName
             "Ljava/lang/String;" // iconType
-            "Ljava/lang/String;" // icon (base64)
+            "Ljava/lang/String;" // icon (base64-encoded)
             "Ljava/lang/String;" // profileClass
-            ")V"
+            ")"
+            "V"                  // (returns) void
     );
 
     const char *icon_type;