diff --git a/extra/hcqfuzz/readme b/extra/hcqfuzz/readme
index d3176f453d..df1668b068 100644
--- a/extra/hcqfuzz/readme
+++ b/extra/hcqfuzz/readme
@@ -4,9 +4,9 @@ To add a new test, define a `TestSpec`-based class in a file in the `tests/` fol
 
 You can choose which tests to load from which file:
 ```bash
-RUN_FILES="hcq,allocator" python3 extra/hcqfuzz/fuzzer.py
+PYTHONPATH=. RUN_FILES="hcq,allocator" python3 extra/hcqfuzz/fuzzer.py
 ```
 Or skip tests from any file:
 ```bash
-SKIP_FILES="allocator" python3 extra/hcqfuzz/fuzzer.py
+PYTHONPATH=. SKIP_FILES="allocator" python3 extra/hcqfuzz/fuzzer.py
 ```
diff --git a/test/external/external_fuzz_ampt.py b/test/external/external_fuzz_ampt.py
index e605f14895..d359599375 100644
--- a/test/external/external_fuzz_ampt.py
+++ b/test/external/external_fuzz_ampt.py
@@ -1,4 +1,5 @@
 import random
+from typing import Optional
 from tinygrad.helpers import round_up
 from tinygrad.runtime.support.am.amdev import AMPageTableTraverseContext
 from test.external.external_test_am import helper_read_entry_components, FakeAM
@@ -59,7 +60,7 @@ class AMPTFuzzer:
 
     return True
 
-  def random_alloc(self):
+  def random_alloc(self) -> Optional[int]:
     if self.total_size - self.alloc_payload < self.min_alloc_size: return None
 
     size = random.randint(self.min_alloc_size, min(self.max_alloc_size, self.total_size - self.alloc_payload))
diff --git a/test/external/external_fuzz_tlsf.py b/test/external/external_fuzz_tlsf.py
index 66eb85ca90..029c9bee9d 100644
--- a/test/external/external_fuzz_tlsf.py
+++ b/test/external/external_fuzz_tlsf.py
@@ -30,6 +30,8 @@ class AllocatorFuzzer:
     return True
 
   def random_alloc(self) -> Optional[int]:
+    if self.total_size - self.alloc_payload < self.min_alloc_size: return None
+
     size = random.randint(self.min_alloc_size, min(self.max_alloc_size, self.total_size - self.alloc_payload))
 
     try: