diff --git a/fuzzers/README.rst b/fuzzers/README.rst
index b3142ca..d052303 100644
--- a/fuzzers/README.rst
+++ b/fuzzers/README.rst
@@ -45,7 +45,7 @@ Usage notes:
 
    .. code::
 
-      ./afl-fuzz -i- -o existing_output_dir [...etc...]
+       afl-fuzz -i- -o existing_output_dir [...etc...]
 
 8. If it shows failures, pipe the failure case into
    ``./build/fuzzers/debug_<fuzzing_tool>``, fix, and repeat.
diff --git a/fuzzers/fuzz_group_decrypt.cpp b/fuzzers/fuzz_group_decrypt.cpp
index 1fc99d7..bb12d0e 100644
--- a/fuzzers/fuzz_group_decrypt.cpp
+++ b/fuzzers/fuzz_group_decrypt.cpp
@@ -54,6 +54,8 @@ int main(int argc, const char *argv[]) {
 
     uint8_t plaintext[max_length];
 
+    uint32_t ratchet_index;
+
     size_t length = check_error(
         olm_inbound_group_session_last_error,
         session,
@@ -61,7 +63,7 @@ int main(int argc, const char *argv[]) {
         olm_group_decrypt(
             session,
             message_buffer, message_length,
-            plaintext, max_length
+            plaintext, max_length, &ratchet_index
         )
     );