diff --git a/.github/workflows/run_fuzzer.yml b/.github/workflows/run_fuzzer.yml
index 37b17b950..bae95c1e2 100644
--- a/.github/workflows/run_fuzzer.yml
+++ b/.github/workflows/run_fuzzer.yml
@@ -23,8 +23,7 @@ jobs:
       id: cache-corpus
       with:
         path: head/fuzzing/corpus.tar
-        key: corpus-${{ github.run_id }}
-        restore-keys: corpus-
+        key: corpus
     - name: Install packages
       shell: bash
       run: |
@@ -55,6 +54,9 @@ jobs:
                 ls -al /usr/lib/llvm-18/lib/clang/18/lib/linux/"$(basename ${f%.*})"-x86_64.a
               done
           fi
+    - name: Check fuzzing dir
+      run: |
+        ls -al head/fuzzing/
     - uses: ./head/.github/actions/build
       with:
         buildtype: 'boost'
@@ -63,9 +65,11 @@ jobs:
         cxxstd: 17
         targets: libs/json/fuzzing//run
     - name: Pack the corpus
-      working-directory: boost-root/libs/json/fuzzing/
+      working-directory: boost-root/libs/json/fuzzing/cmin
       run: |
-        tar cf - cmin > corpus.tar.tmp && mv corpus.tar.tmp "${GITHUB_WORKSPACE}"/head/fuzzing
+        tar cf - * > "$GITHUB_WORKSPACE"/head/fuzzing/corpus.tar
+        ls -al .
+        tar -tf "$GITHUB_WORKSPACE"/head/fuzzing/corpus.tar
     - name: Save the corpus as a github artifact
       uses: actions/upload-artifact@v4
       if: success()
diff --git a/fuzzing/Jamfile b/fuzzing/Jamfile
index 0eef94aca..c2dda9883 100644
--- a/fuzzing/Jamfile
+++ b/fuzzing/Jamfile
@@ -39,32 +39,31 @@ import testing ;
 ] ;
 
 local corpus.tar = [ glob-ex . : corpus.tar ] ;
+local test-corpus ;
 if $(corpus.tar)
 {
     # if an old corpus exists, use it
-    # get it with curl -O --location -J https://bintray.com/pauldreik/boost.json/download_file?file_path=corpus%2Fcorpus.tar
     make old-corpus
         : $(corpus.tar)
         : @untar-corpus
         : <location>oldcorpus
         ;
+    explicit old-corpus ;
 }
 else
 {
-    alias old-corpus ;
+    test-corpus = [ glob-tree-ex ../test : *.json ] ;
 }
-explicit old-corpus ;
-
-
-local initial-corpus = [ glob-tree-ex ../test : *.json ] ;
 
+local old-runs = [ SORT [ glob-tree-ex old_crashes : * ] ] ;
+make old_crashes : : common.MkDir : <location>. ;
+explicit old_crashes ;
 
 local variants = basic_parser parse parser direct_parse ;
 for local variant in basic_parser parse parser direct_parse
 {
     local $(variant)-runs ;
     local fuzzer = fuzzer_$(variant) ;
-    lib $(fuzzer) : fuzz_$(variant).cpp /boost/json//boost_json ;
     exe $(fuzzer)
         : fuzz_$(variant).cpp /boost/json//json_sources
         : requirements
@@ -73,44 +72,44 @@ for local variant in basic_parser parse parser direct_parse
         ;
 
     # make sure the old crashes pass without problems
-    local old-runs = [ glob-tree-ex old_crashes/$(variant) : * ] ;
     if $(old-runs)
     {
         run $(fuzzer)
             : target-name $(variant)-run-crashes
-            : input-files [ SORT $(old-runs) ]
+            : input-files $(old-runs)
             ;
+        explicit $(variant)-run-crashes ;
         $(variant)-runs += $(variant)-run-crashes ;
     }
 
-    make oldcorpus/$(variant)
-        : old-corpus
-        : common.MkDir
-        : <location>.
-        ;
-    explicit oldcorpus/$(variant) ;
-
-    # make an initial corpus from the test data already in the repo
-    local seed-corpus ;
-    for file in $(initial-corpus)
+    local old-corpus-deps ;
+    if $(corpus.tar)
     {
-        local copied = $(variant)/$(file:D=) ;
-        make $(copied) : $(file) : common.copy : <location>seedcorpus ;
-        explicit $(copied) ;
-        seed-corpus += $(copied) ;
+        old-corpus-deps = old-corpus ;
     }
-    make seedcorpus/$(variant)
-        : $(seed-corpus)
+    else
+    {
+        # make an initial corpus from the test data already in the repo
+        for file in $(test-corpus)
+        {
+            local copied = $(variant)/$(file:D=) ;
+            make $(copied) : $(file) : common.copy : <location>oldcorpus ;
+            explicit $(copied) ;
+            old-corpus-deps += $(copied) ;
+        }
+    }
+    make oldcorpus/$(variant)
+        : $(old-corpus-deps)
         : common.MkDir
         : <location>.
         ;
-    explicit seedcorpus/$(variant) ;
+    explicit oldcorpus/$(variant) ;
 
     # run the fuzzer for a short while
     make out/$(variant)
         : $(fuzzer)
           oldcorpus/$(variant)
-          seedcorpus/$(variant)
+          old_crashes
         : @run-fuzzer
         : <location>.
           <flags>$(.MAXTIME)
@@ -122,8 +121,9 @@ for local variant in basic_parser parse parser direct_parse
     # minimize the corpus
     make cmin/$(variant)
         : $(fuzzer)
-          oldcorpus/$(variant)
           out/$(variant)
+          oldcorpus/$(variant)
+          old_crashes
         : @run-fuzzer
         : <location>.
           <flags>-merge=1
@@ -178,7 +178,7 @@ rule run-fuzzer ( target : sources * : props * )
 actions run-fuzzer
 {
     $(.UBSAN_OPTIONS)
-    $(>[1]) $(<) $(>[2]) $(>[3]) $(FLAGS)
+    $(>[1]) $(<) $(>[2-]) $(FLAGS)
 }
 
 .TOUCH_FILE = [ common.file-touch-command ] ;
diff --git a/fuzzing/old_crashes/basic_parser/20200903.json b/fuzzing/old_crashes/20200903.json
similarity index 100%
rename from fuzzing/old_crashes/basic_parser/20200903.json
rename to fuzzing/old_crashes/20200903.json
diff --git a/fuzzing/old_crashes/direct_parse/array.json b/fuzzing/old_crashes/array.json
similarity index 100%
rename from fuzzing/old_crashes/direct_parse/array.json
rename to fuzzing/old_crashes/array.json
diff --git a/fuzzing/old_crashes/parser/clusterfuzz-testcase-minimized-fuzz_parser-4763163676508160 b/fuzzing/old_crashes/clusterfuzz-testcase-minimized-fuzz_parser-4763163676508160
similarity index 100%
rename from fuzzing/old_crashes/parser/clusterfuzz-testcase-minimized-fuzz_parser-4763163676508160
rename to fuzzing/old_crashes/clusterfuzz-testcase-minimized-fuzz_parser-4763163676508160
diff --git a/fuzzing/old_crashes/parser/clusterfuzz-testcase-minimized-fuzz_parser-6038712407425024 b/fuzzing/old_crashes/clusterfuzz-testcase-minimized-fuzz_parser-6038712407425024
similarity index 100%
rename from fuzzing/old_crashes/parser/clusterfuzz-testcase-minimized-fuzz_parser-6038712407425024
rename to fuzzing/old_crashes/clusterfuzz-testcase-minimized-fuzz_parser-6038712407425024
diff --git a/fuzzing/old_crashes/parser/clusterfuzz-testcase-minimized-fuzz_parser-6157345913700352 b/fuzzing/old_crashes/clusterfuzz-testcase-minimized-fuzz_parser-6157345913700352
similarity index 100%
rename from fuzzing/old_crashes/parser/clusterfuzz-testcase-minimized-fuzz_parser-6157345913700352
rename to fuzzing/old_crashes/clusterfuzz-testcase-minimized-fuzz_parser-6157345913700352
diff --git a/fuzzing/old_crashes/basic_parser/crash_00.json b/fuzzing/old_crashes/crash_00.json
similarity index 100%
rename from fuzzing/old_crashes/basic_parser/crash_00.json
rename to fuzzing/old_crashes/crash_00.json
diff --git a/fuzzing/old_crashes/basic_parser/crash_01.json b/fuzzing/old_crashes/crash_01.json
similarity index 100%
rename from fuzzing/old_crashes/basic_parser/crash_01.json
rename to fuzzing/old_crashes/crash_01.json
diff --git a/fuzzing/old_crashes/basic_parser/gh13_1.json b/fuzzing/old_crashes/gh13_1.json
similarity index 100%
rename from fuzzing/old_crashes/basic_parser/gh13_1.json
rename to fuzzing/old_crashes/gh13_1.json
diff --git a/fuzzing/old_crashes/basic_parser/gh13_3.json b/fuzzing/old_crashes/gh13_3.json
similarity index 100%
rename from fuzzing/old_crashes/basic_parser/gh13_3.json
rename to fuzzing/old_crashes/gh13_3.json
diff --git a/fuzzing/old_crashes/basic_parser/gh20_0.json b/fuzzing/old_crashes/gh20_0.json
similarity index 100%
rename from fuzzing/old_crashes/basic_parser/gh20_0.json
rename to fuzzing/old_crashes/gh20_0.json
diff --git a/fuzzing/old_crashes/basic_parser/gh21_0.json b/fuzzing/old_crashes/gh21_0.json
similarity index 100%
rename from fuzzing/old_crashes/basic_parser/gh21_0.json
rename to fuzzing/old_crashes/gh21_0.json
diff --git a/fuzzing/old_crashes/parse/gh221.json b/fuzzing/old_crashes/gh221.json
similarity index 100%
rename from fuzzing/old_crashes/parse/gh221.json
rename to fuzzing/old_crashes/gh221.json
diff --git a/fuzzing/old_crashes/basic_parser/minimized-from-58a10325bce45df3e0b4988f932e5a400a344687 b/fuzzing/old_crashes/minimized-from-58a10325bce45df3e0b4988f932e5a400a344687
similarity index 100%
rename from fuzzing/old_crashes/basic_parser/minimized-from-58a10325bce45df3e0b4988f932e5a400a344687
rename to fuzzing/old_crashes/minimized-from-58a10325bce45df3e0b4988f932e5a400a344687
diff --git a/fuzzing/old_crashes/direct_parse/tuple.json b/fuzzing/old_crashes/tuple.json
similarity index 100%
rename from fuzzing/old_crashes/direct_parse/tuple.json
rename to fuzzing/old_crashes/tuple.json
diff --git a/fuzzing/old_crashes/direct_parse/valid_cxx14.json b/fuzzing/old_crashes/valid_cxx14.json
similarity index 100%
rename from fuzzing/old_crashes/direct_parse/valid_cxx14.json
rename to fuzzing/old_crashes/valid_cxx14.json
diff --git a/fuzzing/old_crashes/direct_parse/valid_cxx17.json b/fuzzing/old_crashes/valid_cxx17.json
similarity index 100%
rename from fuzzing/old_crashes/direct_parse/valid_cxx17.json
rename to fuzzing/old_crashes/valid_cxx17.json