diff --git a/tests/test_mem_trim.py b/tests/test_mem_trim.py
index 67fa98f34..ec80f25b8 100644
--- a/tests/test_mem_trim.py
+++ b/tests/test_mem_trim.py
@@ -6,6 +6,7 @@
 a floor, and the spare ones are counted out as well as in.
 python -I -B tests/test_mem_trim.py
 """
+import re
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
@@ -42,7 +43,9 @@ def main():
     need(begin.index("r.streams.resize(1)") < begin.index("r.si = 0"), "the streams given back are used after")
 
     tex = (ROOT / "gpu/vk/vk_texture.cpp").read_text(encoding="utf-8")
-    need(tex.count("if (!bc_scratch_layout(cmd)) return false;") == 2, "a BC3 upload uses a scratch it did not ask for")
+    # (the second argument says the upload was encoded at an even size and needs the second scratch)
+    asks = re.findall(r"if \(!bc_scratch_layout\(cmd(?:, [\w.>-]+)?\)\) return false;", tex)
+    need(len(asks) == 2, "a BC3 upload uses a scratch it did not ask for")
     need("bc_have = false" in block(tex, "void bc_scratch_idle("), "the scratch given back is still taken for made")
     need("dead.push_back" in block(tex, "void bc_scratch_idle("), "the scratch is freed with no wait for the GPU")
     need("total_bytes -= std::min(total_bytes, tex.bytes + tex.pad)" in tex, "a texture leaves the budget by its texels only")