diff --git a/generated/json_data/qol.jsonc b/generated/json_data/qol.jsonc
index cbc8c5b0..ac16d8c8 100644
--- a/generated/json_data/qol.jsonc
+++ b/generated/json_data/qol.jsonc
@@ -3848,7 +3848,7 @@
                         },
                         {
                             "senderId": 600482, // [Relay] Relay
-                            "targetId": 77591, // [SpecialFunction] [DEC] Ruins Entrance 
+                            "targetId": 77591, // [SpecialFunction] [DEC] Ruins Entrance
                             "state": "ZERO",
                             "message": "DECREMENT"
                         },
@@ -3997,7 +3997,7 @@
                             "type": "PlayerInAreaRelay"
                         },
                         {
-                            "id": 77591, // [SpecialFunction] [DEC] Ruins Entrance 
+                            "id": 77591, // [SpecialFunction] [DEC] Ruins Entrance
                             "type": "ScriptLayerController",
                             "layerChangeRoomId": 944775450,
                             "layerChangeLayerId": 3
diff --git a/src/bin/randomprime_patcher.rs b/src/bin/randomprime_patcher.rs
index 35ff3231..e15c4b8c 100644
--- a/src/bin/randomprime_patcher.rs
+++ b/src/bin/randomprime_patcher.rs
@@ -10,6 +10,7 @@ use clap::Format;
 use std::{
     panic,
     process::Command,
+    time::Instant,
 };
 
 struct ProgressNotifier
@@ -101,9 +102,10 @@ fn maybe_pause_at_exit()
 
 fn main_inner() -> Result<(), String>
 {
+    let start_time = Instant::now();
     let patch_config = PatchConfig::from_cli_options()?;
     let pn = ProgressNotifier::new(patch_config.quiet);
-    patches::patch_iso(patch_config, pn)?;
+    patches::patch_iso(patch_config, pn, start_time)?;
     println!("Done");
     Ok(())
 }
diff --git a/src/c_interface.rs b/src/c_interface.rs
index 85f00eaa..f7878e5f 100644
--- a/src/c_interface.rs
+++ b/src/c_interface.rs
@@ -13,6 +13,7 @@ use std::{
     panic,
     path::Path,
     os::raw::c_char,
+    time::Instant,
 };
 
 use serde::{Serialize};
@@ -119,13 +120,16 @@ impl structs::ProgressNotifier for ProgressNotifier
 fn inner(config_json: *const c_char, cb_data: *const (), cb: extern fn(*const (), *const c_char))
     -> Result<(), String>
 {
+    let start_time = Instant::now();
+
     let config_json = unsafe { CStr::from_ptr(config_json) }.to_str()
         .map_err(|e| format!("JSON parse failed: {}", e))?;
 
     let patch_config = PatchConfig::from_json(config_json)?;
 
     let pn = ProgressNotifier::new(cb_data, cb);
-    patches::patch_iso(patch_config, pn)?;
+    patches::patch_iso(patch_config, pn, start_time)?;
+
     Ok(())
 }
 
diff --git a/src/patches.rs b/src/patches.rs
index b98edf1e..397fe757 100644
--- a/src/patches.rs
+++ b/src/patches.rs
@@ -14421,7 +14421,7 @@ fn patch_arboretum_sandstone<'a>(patcher: &mut PrimePatcher<'_, 'a>)
     });
 }
 
-pub fn patch_iso<T>(config: PatchConfig, mut pn: T) -> Result<(), String>
+pub fn patch_iso<T>(config: PatchConfig, mut pn: T, start_time: Instant) -> Result<(), String>
     where T: structs::ProgressNotifier
 {
     let mut audio_override_patches: Vec<AudioOverridePatch> = Vec::new();
@@ -14473,7 +14473,7 @@ pub fn patch_iso<T>(config: PatchConfig, mut pn: T) -> Result<(), String>
     let mut reader = Reader::new(&config.input_iso[..]);
     let mut gc_disc: structs::GcDisc = reader.read(());
 
-    if gc_disc.find_file("randomprime.txt").is_some() {
+    if gc_disc.find_file("randomprime.json").is_some() {
         Err(concat!("The input ISO has already been randomized once before. ",
                     "You must start from an unmodified ISO every time."
         ))?
@@ -14489,6 +14489,8 @@ pub fn patch_iso<T>(config: PatchConfig, mut pn: T) -> Result<(), String>
 
     build_and_run_patches(&mut gc_disc, &config, audio_override_patches)?;
 
+    println!("Created patches in {:?}", start_time.elapsed());
+
     {
         let json_string = serde_json::to_string(&config)
             .map_err(|e| format!("Failed to serialize patch config: {}", e))?;
@@ -17572,9 +17574,7 @@ fn build_and_run_patches<'r>(gc_disc: &mut structs::GcDisc<'r>, config: &PatchCo
         );
     }
 
-    let time = Instant::now();
     patcher.run(gc_disc)?;
-    println!("Created patches in {:?}", time.elapsed());
 
     Ok(())
 }